1st Grade Math Flashcards: Adding And Subtracting 10

What this deck covers

This deck focuses on Adding And Subtracting 10, giving you a quick way to review the definitions, rules, and examples that matter most for 1st Grade Math.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Find and correct the error: A student says $10$ more than $65$ is $66$.

Answer: Correct answer: $75$. Student only added $1$; should change tens digit.

Flashcard 2: Which number is $10$ more than $26$: $16$, $36$, or $46$?

Answer: $36$. Only $36$ has tens digit one more than $26$'s.

Flashcard 3: What is $10$ more than $40$?

Answer: $50$. $40 + 10 = 50$ because the tens digit increases from $4$ to $5$.

Flashcard 4: What is $10$ more than $41$?

Answer: $51$. Increase tens digit from $4$ to $5$.

Flashcard 5: Identify the missing number: $47 + 10 = \square$.

Answer: $57$. Add $10$ to $47$ by increasing tens digit to $5$.

Flashcard 6: What is $10$ less than $19$?

Answer: $9$. $19 - 10 = 9$ because we go from $1$ ten to $0$ tens.

Flashcard 7: What is $10$ more than $60$?

Answer: $70$. Change the tens digit from $6$ to $7$, keep ones digit $0$.

Flashcard 8: What is $10$ less than $70$?

Answer: $60$. $70 - 10 = 60$ because the tens digit decreases from $7$ to $6$.

Flashcard 9: What is $10$ less than $58$?

Answer: $48$. $58 - 10 = 48$ because the tens digit decreases from $5$ to $4$.

Flashcard 10: What is $10$ less than $34$?

Answer: $24$. $34 - 10 = 24$ because the tens digit decreases from $3$ to $2$.

Flashcard 11: Identify the number that is $10$ more than $34$.

Answer: $44$. Change the tens digit from $3$ to $4$, keep ones digit $4$.

Flashcard 12: What is $10$ more than $99$?

Answer: $109$. $99 + 10 = 109$ because we need to regroup into hundreds.

Flashcard 13: Which number is $10$ less than $62$: $42$, $52$, or $72$?

Answer: $52$. Only $52$ has tens digit one less than $62$'s.

Flashcard 14: Identify the number that is $10$ more than $26$.

Answer: $36$. $26 + 10 = 36$ because the tens digit increases from $2$ to $3$.

Flashcard 15: Which digit changes when you add $10$ to a two-digit number?

Answer: The tens digit increases by $1$. Adding $10$ adds one group of ten, changing only the tens place.

Flashcard 16: What is $10$ less than $47$?

Answer: $37$. Change the tens digit from $4$ to $3$, keep ones digit $7$.

Flashcard 17: Find and correct the error: A student says $10$ less than $40$ is $39$.

Answer: Correct answer: $30$. Student only subtracted $1$; should change tens digit.

Flashcard 18: What is $10$ more than $70$?

Answer: $80$. $70 + 10 = 80$ because the tens digit increases from $7$ to $8$.

Flashcard 19: What is $10$ more than $19$?

Answer: $29$. $19 + 10 = 29$ because the tens digit increases from $1$ to $2$.

Flashcard 20: What is $10$ more than $90$?

Answer: $100$. Adding $10$ to $90$ gives $10$ tens or $100$.

Flashcard 21: Identify the number that is $10$ less than $26$.

Answer: $16$. $26 - 10 = 16$ because the tens digit decreases from $2$ to $1$.

Flashcard 22: What is $10$ less than $90$?

Answer: $80$. Subtract $1$ from tens digit: $9$ becomes $8$.

Flashcard 23: Which option is $10$ more than $63$: $53$, $73$, or $83$?

Answer: $73$. $63 + 10 = 73$ because the tens digit increases from $6$ to $7$.

Flashcard 24: What is $10$ more than $58$?

Answer: $68$. $58 + 10 = 68$ because the tens digit increases from $5$ to $6$.

Flashcard 25: What does adding $10$ to a two-digit number change: the tens digit, the ones digit, or both?

Answer: The tens digit increases by $1$; the ones digit stays the same. Adding $10$ means adding one group of ten.

Flashcard 26: What does it mean to find $10$ more than a two-digit number?

Answer: Add $10$ to the number. Adding $10$ increases the value by one ten.

Flashcard 27: What is $10$ less than $41$?

Answer: $31$. Decrease tens digit from $4$ to $3$.

Flashcard 28: Identify the missing number: $\square - 10 = 33$.

Answer: $43$. To get $33$ after subtracting $10$, start with $43$.

Flashcard 29: What does subtracting $10$ from a two-digit number change: the tens digit, the ones digit, or both?

Answer: The tens digit decreases by $1$; the ones digit stays the same. Subtracting $10$ means removing one group of ten.

Flashcard 30: What does it mean to find $10$ less than a two-digit number?

Answer: Subtract $10$ from the number. Subtracting $10$ decreases the value by one ten.

Flashcard 31: What is $10$ less than $23$?

Answer: $13$. Change the tens digit from $2$ to $1$, keep ones digit $3$.

Flashcard 32: Which digit changes when you subtract $10$ from a two-digit number?

Answer: The tens digit decreases by $1$. Removing $10$ takes away one group of ten from the tens place.

Flashcard 33: What is $10$ less than $99$?

Answer: $89$. $99 - 10 = 89$ because the tens digit decreases from $9$ to $8$.

Flashcard 34: Find and correct the mistake: '$10$ more than $72$ is $73$.' What is correct?

Answer: $10$ more than $72$ is $82$. The tens digit should change from $7$ to $8$, not the ones.

Flashcard 35: What is $10$ less than $40$?

Answer: $30$. $40 - 10 = 30$ because the tens digit decreases from $4$ to $3$.

Flashcard 36: Which option is $10$ less than $63$: $43$, $53$, or $73$?

Answer: $53$. $63 - 10 = 53$ because the tens digit decreases from $6$ to $5$.

Flashcard 37: What is $10$ more than $34$?

Answer: $44$. $34 + 10 = 44$ because the tens digit increases from $3$ to $4$.

Flashcard 38: What is $10$ less than $60$?

Answer: $50$. Change the tens digit from $6$ to $5$, keep ones digit $0$.

Flashcard 39: Identify the number that is $10$ less than $34$.

Answer: $24$. Change the tens digit from $3$ to $2$, keep ones digit $4$.

Flashcard 40: Find and correct the mistake: '$10$ less than $85$ is $75$.' What is correct?

Answer: $10$ less than $85$ is $75$. The statement is already correct; $85 - 10 = 75$.

Flashcard 41: What is $10$ more than $47$?

Answer: $57$. Change the tens digit from $4$ to $5$, keep ones digit $7$.

Flashcard 42: What is $10$ more than $23$?

Answer: $33$. Change the tens digit from $2$ to $3$, keep ones digit $3$.