Read and Write Three-Digit Numbers - 2nd Grade Math

1. How do you write 490 in words?
   Answer: four hundred ninety 490 is written as "four hundred ninety." Choice A ("four hundred ninety-zero") incorrectly reads the zero digit aloud as its own word. Choice C ("four hundred and ninety") adds the word "and," which isn't used in standard number names. Choice D ("four hundreds ninety") incorrectly pluralizes "hundred."
2. What is "two hundred forty-one" written as a number?
   Answer: 241 The correct answer is 241, because 'two hundred forty-one' means 2 hundreds, 4 tens, and 1 one. Choice B (214) swaps the tens and ones digits. Choice C (2401) adds an extra digit that doesn't belong. Choice D (201) leaves out the tens place.
3. Which number shows "nine hundred twenty-four"?
   Answer: 924 Nine hundred twenty-four is written as 924. Choice A is missing the twenty. Choice B adds an extra digit that doesn't belong. Choice D swaps the order of the last two digits.
4. Write 472 in expanded form.
   Answer: $400 + 70 + 2$ 472 has 4 hundreds, 7 tens, and 2 ones, so its expanded form is 400 + 70 + 2, making Choice A correct. Choice B is wrong because it uses the digits themselves instead of their place values. Choice C is wrong because it combines the tens and ones together instead of keeping them separate. Choice D is wrong because it combines the hundreds and tens together instead of keeping them separate.
5. Emma writes the number four hundred six in expanded form. Then she adds 30 to that number. What is the new number in standard form?
   Answer: 436 The new number is 436, since 406 plus 30 equals 436. Choosing 466 would mean adding 60 instead of 30. Choosing 406 leaves out the addition of 30 entirely. Choosing 430 comes from adding 30 to only part of the number instead of the whole value.
6. Which shows 631 in expanded form?
   Answer: $600 + 30 + 1$ 631 in expanded form is $600 + 30 + 1$, since 631 has 6 hundreds, 3 tens, and 1 one. Choice A mistakenly treats the tens digit as another hundreds digit. Choice B treats the hundreds digit as if it were a tens digit. Choice C uses only the digits themselves instead of their place values.
7. What is "two hundred sixteen" written as a number?
   Answer: 216 The correct answer is 216, because 'two hundred sixteen' means 2 hundreds, 1 ten, and 6 ones. Choice A (261) swaps the tens and ones digits. Choice B (26) leaves out the hundreds place. Choice D (2016) adds an extra digit that doesn't belong.
8. What is the standard form of $500+60+9$?
   Answer: 569 500 + 60 + 9 combines 5 hundreds, 6 tens, and 9 ones to make 569. 560 leaves out the 9 ones. 506 leaves out the 6 tens. 596 swaps the tens and ones digits.
9. How do you write 731 in words? Use the same style as 542 written as five hundred forty-two.
   Answer: seven hundred thirty-one Following the same style as five hundred forty-two, 731 is written as seven hundred thirty-one, using hundred (not hundreds) and a hyphen between thirty and one. Choice B incorrectly pluralizes hundred. Choice C leaves out the hyphen. Choice D adds the word and, which is not used in this style.
10. Which of these shows the same number written in three different forms: standard form, word form, and expanded form?
    Answer: $892$, eight hundred ninety-two, $800 + 90 + 2$ When you see a question asking about different forms of numbers, you need to check that the standard form (regular digits), word form (written out), and expanded form (broken into place values) all represent the exact same number. Let's examine choice B, which is correct: $892$, eight hundred ninety-two, $800 + 90 + 2$. The standard form shows $892$. The word form "eight hundred ninety-two" also represents $892$. The expanded form breaks down the place values: $800$ (8 hundreds) + $90$ (9 tens) + $2$ (2 ones) = $892$. All three forms match perfectly. Now let's see why the other choices are wrong. Choice A has $829$ in standard form, but "eight hundred twenty-nine" in word form, and $800 + 90 + 2$ in expanded form. The expanded form actually equals $892$, not $829$, so the forms don't match. Choice C shows $892$ in standard form and "eight hundred ninety-two" in word form (both correct), but the expanded form $800 + 20 + 9$ equals $829$, not $892$. Choice D has $892$ in standard form, but "eight hundred twenty-nine" in word form, which represents $829$, creating a mismatch. When checking number forms, always verify each form independently, then confirm they all represent the same value. Pay special attention to the tens and ones places, as these are where most mistakes occur in expanded form.
11. Look at this pattern: 'six hundred eight', 'six hundred eighteen', 'six hundred twenty-eight'. If the pattern continues, what is the next number written in standard form?
    Answer: $638$ Each number in the pattern is 10 more than the one before it, so the next number after 628 is 638. Choice B adds 20 instead of 10. Choice C repeats the number that's already given in the pattern. Choice D adds 40 instead of 10.
12. Which number matches "two hundred thirty-five"?
    Answer: 235 Two hundred thirty-five is written as 235. Choice A swaps the tens and ones digits. Choice B adds an extra digit that doesn't belong. Choice D also adds an extra digit that doesn't belong.
13. Write 305 in words.
    Answer: three hundred five 305 has 3 hundreds, 0 tens, and 5 ones, which is written as three hundred five. Three hundred fifty describes 350, not 305. In standard American math convention, the word 'and' is not used between hundreds and ones, so three hundred and five is not the expected form here even though some people use it in everyday speech. Three hundred zero-five isn't how number words are written; the zero in the tens place isn't spoken as its own word.
14. A three-digit number has 4 hundreds, 2 tens, and 7 ones. How should this number be written in word form?
    Answer: four hundred twenty-seven 4 hundreds, 2 tens, and 7 ones make the number 427, written in words as four hundred twenty-seven. Choice B just lists the digits instead of using place-value words. Choice C drops the hundreds place entirely. Choice D incorrectly adds the word ones to the end.
15. What is $300 + 6$ in standard form?
    Answer: 306 Combining 300 and 6 in standard form gives 306. Choice A, 360, swaps the placement of the 6, putting it in the tens place instead of the ones place. Choice B, 3006, comes from writing the numbers side by side instead of adding their place values. Choice D, 36, drops the hundreds place value entirely.
16. Which shows 678 in word form?
    Answer: six hundred seventy-eight The standard word form of 678 is "six hundred seventy-eight," written without the word "and" and with a hyphen joining seventy and eight, so B is correct. Choice A incorrectly inserts the word "and," which is not used in standard American number names. Choice C incorrectly makes "hundred" plural. Choice D swaps the tens and ones digits, naming a different number entirely.
17. How do you write 639 in words?
    Answer: six hundred thirty-nine The correct way to write 639 in words is six hundred thirty-nine, using the singular hundred and a hyphen between thirty and nine. Choice A is missing the hyphen. Choice B incorrectly uses the plural hundreds. Choice C adds the word and, which is not used in standard American number writing.
18. A mystery number has the same hundreds digit as 521, the same tens digit as 847, and the same ones digit as 193. What is this mystery number in word form?
    Answer: five hundred forty-three When you see a question about place value and digit positions, you need to carefully identify which digit goes in each place: hundreds, tens, and ones. Let's break down this mystery number step by step. First, find the hundreds digit from 521 - that's the 5. Next, find the tens digit from 847 - that's the 4. Finally, find the ones digit from 193 - that's the 3. So your mystery number is 543. Now you need to write 543 in word form. Five hundred represents the hundreds place, forty represents the tens place (remember that 40 is written as "forty," not "four zero"), and three represents the ones place. The complete word form is "five hundred forty-three." Looking at the wrong answers: Choice A says "five hundred four three," which incorrectly separates the tens and ones digits instead of combining them into "forty-three." Choice B writes "five hundred forty three" without the hyphen, but more importantly, many students might not notice this represents the same number as the correct answer - the key difference here is that B might be missing proper formatting that's expected in formal number writing. Choice C says "five forty-three," which leaves out the word "hundred" entirely, making it unclear and incorrect. Remember this strategy: when writing numbers in word form, always include "hundred" for the hundreds place, combine the tens and ones into compound numbers when appropriate (like "forty-three"), and double-check that each digit lands in the right place value position.
19. What number is "six hundred nineteen"?
    Answer: 619 Six hundred nineteen is written as 619. Choice B (691) swaps the tens and ones digits. Choice C (6109) and Choice D (6910) both add an extra zero, confusing the place values.
20. What is $800 + 70 + 4$ in standard form?
    Answer: 874 The correct answer is 874, because 800 + 70 + 4 combines the hundreds, tens, and ones into one number. Choice B (7074) strings the digits together instead of adding their place values. Choice C (844) swaps the ones and tens digits. Choice D (784) swaps the hundreds and tens digits.

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