1st Grade Math Flashcards: Add Three Numbers In Word Problems

What this deck covers

This deck focuses on Add Three Numbers In Word Problems, 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: What is the total number of cookies if you eat $2$, your friend eats $3$, and your family eats $6$?

Answer: $11$. Add all cookies eaten: $2 + 3 + 6 = 11$.

Flashcard 2: What number makes this true: $10 + 3 + \square = 18$?

Answer: $5$. Since $10 + 3 = 13$, subtract from $18$: $18 - 13 = 5$.

Flashcard 3: What number makes this true: $\square + 7 + 7 = 20$?

Answer: $6$. Since $7 + 7 = 14$, subtract from $20$: $20 - 14 = 6$.

Flashcard 4: What is the total number of pets: $3$ cats, $2$ dogs, and $4$ fish?

Answer: $3 + 2 + 4 = 9$. Add all three types of pets to find the total.

Flashcard 5: What is the total: $6$ apples in a bowl, $5$ on a plate, and $2$ in a bag?

Answer: $6 + 5 + 2 = 13$. Combine all three locations to get the total count.

Flashcard 6: What is the total: $5$ boys, $6$ girls, and $2$ teachers in a room?

Answer: $5 + 6 + 2 = 13$. Add all three groups of people together.

Flashcard 7: What is the sum: $8$ books on a shelf, $2$ on a desk, and $3$ in a backpack?

Answer: $8 + 2 + 3 = 13$. Combine books from all three places.

Flashcard 8: What is the total number of apples if you have $6$, your friend has $5$, and your sister has $3$?

Answer: $14$. Add all three numbers: $6 + 5 + 3 = 14$.

Flashcard 9: What number makes the equation true: $9 + 4 + x = 20$?

Answer: $x = 7$. Find the missing addend: $20 - 9 - 4 = 7$.

Flashcard 10: What is the sum: $10$ blocks in a tower, $3$ blocks on the table, and $2$ blocks in a bin?

Answer: $10 + 3 + 2 = 15$. Combine blocks from all three places.

Flashcard 11: What is the total number of books if there are $5$ on the table, $5$ on the shelf, and $5$ in a box?

Answer: $15$. Add books from all locations: $5 + 5 + 5 = 15$.

Flashcard 12: What number makes this true: $\square + 4 + 9 = 17$?

Answer: $4$. Since $4 + 9 = 13$, subtract from $17$: $17 - 13 = 4$.

Flashcard 13: What number makes the equation true: $x + 6 + 6 = 15$?

Answer: $x = 3$. Subtract known addends: $15 - 6 - 6 = 3$.

Flashcard 14: What number makes the equation true: $8 + x + 1 = 10$?

Answer: $x = 1$. Find the missing number: $10 - 8 - 1 = 1$.

Flashcard 15: What is the sum: $9$ crayons in a box, $1$ on the floor, and $4$ in a cup?

Answer: $9 + 1 + 4 = 14$. Add crayons from all three locations.

Flashcard 16: What number makes this true: $\square + 5 + 4 = 15$?

Answer: $6$. Since $5 + 4 = 9$, subtract from $15$: $15 - 9 = 6$.

Flashcard 17: What is the total number of coins if you have $7$ pennies, $6$ nickels, and $2$ dimes?

Answer: $15$. Add all coin types: $7 + 6 + 2 = 15$.

Flashcard 18: What is the sum in $8 + 1 + 9 = \square$?

Answer: $18$. Add left to right: $8 + 1 = 9$, then $9 + 9 = 18$.

Flashcard 19: What is $x$: $3$ birds are on a tree, $7$ are on a fence, and $x$ are on the ground. There are $18$ birds total.

Answer: $x = 8$. Find missing birds: $18 - 3 - 7 = 8$.

Flashcard 20: What is the total: $2$ shells on Monday, $7$ on Tuesday, and $6$ on Wednesday?

Answer: $2 + 7 + 6 = 15$. Add shells collected on all three days.

Flashcard 21: What is the total number of stickers if you have $9$, your friend has $4$, and your brother has $2$?

Answer: $15$. Add all stickers: $9 + 4 + 2 = 15$.

Flashcard 22: What is the sum of three numbers in the equation $4 + 7 + 2 = \square$?

Answer: $13$. Add left to right: $4 + 7 = 11$, then $11 + 2 = 13$.

Flashcard 23: What number makes the equation true: $7 + x + 2 = 16$?

Answer: $x = 7$. Subtract known values from total: $16 - 7 - 2 = 7$.

Flashcard 24: What is the total number of balloons if there are $2$ red, $6$ blue, and $7$ green balloons?

Answer: $15$. Add all balloon colors: $2 + 6 + 7 = 15$.

Flashcard 25: What is the sum in $1 + 8 + 6 = \square$?

Answer: $15$. Add left to right: $1 + 8 = 9$, then $9 + 6 = 15$.

Flashcard 26: What number makes this true: $2 + 9 + \square = 16$?

Answer: $5$. Since $2 + 9 = 11$, subtract from $16$: $16 - 11 = 5$.

Flashcard 27: What equation matches: You have $4$ red balloons, $3$ blue, and $2$ green. How many balloons in all?

Answer: $4 + 3 + 2 = 9$. Add all three groups together to find the total.

Flashcard 28: What is the total number of toys if there are $4$ cars, $3$ dolls, and $8$ blocks?

Answer: $15$. Add all toy types: $4 + 3 + 8 = 15$.

Flashcard 29: What is the total: $1$ cookie in a jar, $8$ cookies on a plate, and $6$ cookies in a box?

Answer: $1 + 8 + 6 = 15$. Add cookies from all three containers.

Flashcard 30: What is the sum: $7$ stickers on page $1$, $4$ on page $2$, and $1$ on page $3$?

Answer: $7 + 4 + 1 = 12$. Add stickers from all three pages together.

Flashcard 31: Which equation matches: $2$ red cars, $6$ blue cars, and $x$ green cars make $11$ cars total?

Answer: $2 + 6 + x = 11$. Sets up equation to find the unknown green cars.

Flashcard 32: What number makes this true: $6 + 6 + \square = 20$?

Answer: $8$. Since $6 + 6 = 12$, subtract from $20$: $20 - 12 = 8$.

Flashcard 33: What equation matches: There are $14$ marbles total. You have $6$ and $5$. How many more marbles, $x$, are there?

Answer: $6 + 5 + x = 14$. Shows the equation for finding the missing marbles.

Flashcard 34: What number makes this true: $3 + \square + 8 = 20$?

Answer: $9$. Since $3 + 8 = 11$, subtract from $20$: $20 - 11 = 9$.

Flashcard 35: What number makes this true: $\square + 2 + 3 = 12$?

Answer: $7$. Since $2 + 3 = 5$, subtract from $12$: $12 - 5 = 7$.

Flashcard 36: What is the sum in $9 + 9 + 2 = \square$?

Answer: $20$. Add left to right: $9 + 9 = 18$, then $18 + 2 = 20$.

Flashcard 37: What is $x$: $6$ kids are on swings, $4$ are on slides, and $x$ are on the sandbox. There are $15$ kids total.

Answer: $x = 5$. Subtract known groups from total: $15 - 6 - 4 = 5$.

Flashcard 38: What number makes this true: $5 + \square + 5 = 19$?

Answer: $9$. Since $5 + 5 = 10$, subtract from $19$: $19 - 10 = 9$.

Flashcard 39: What is $x$: $5$ pencils are sharp, $2$ are broken, and $x$ are new. There are $12$ pencils total.

Answer: $x = 5$. Subtract known pencils: $12 - 5 - 2 = 5$.

Flashcard 40: What number makes the equation true: $x + 5 + 3 = 12$?

Answer: $x = 4$. Subtract the known addends from the sum: $12 - 5 - 3 = 4$.