1st Grade Math Flashcards: Addition And Subtraction Properties

What this deck covers

This deck focuses on Addition And Subtraction Properties, 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 sum using the commutative property: if $8 + 3 = 11$, what is $3 + 8$?

Answer: $11$. Swapping addends gives the same sum.

Flashcard 2: What is $7 + 0$ using the identity property of addition?

Answer: $7$. Adding zero leaves the number unchanged.

Flashcard 3: What property of subtraction says $a - 0 = a$?

Answer: Zero property of subtraction. Subtracting zero doesn't change a number.

Flashcard 4: What is $3 + 7 + 5$ by grouping $3 + 7$ first?

Answer: $15$. First add $3+7=10$, then $10+5=15$.

Flashcard 5: What is $2 + 7 + 3$ using $(7 + 3)$ to make $10$?

Answer: $12$. Regroup as $2 + (7 + 3) = 2 + 10 = 12$.

Flashcard 6: Find the value: $2 + (5 + 3)$ (use the associative property to regroup).

Answer: $10$. Calculate inside parentheses first: $5+3=8$, then $2+8=10$.

Flashcard 7: What is $0 + 12$ using the identity property of addition?

Answer: $12$. Zero plus any number equals that number.

Flashcard 8: What is $2 + 6 + 4$ by making a ten (use grouping)?

Answer: $12$. Group $6+4=10$, then $2+10=12$.

Flashcard 9: What is the sum if you switch the addends in $8 + 3$ to $3 + 8$?

Answer: $11$. Commutative property: order doesn't change the sum.

Flashcard 10: What property of addition says $(a + b) + c = a + (b + c)$?

Answer: Associative property of addition. Grouping doesn't change the sum.

Flashcard 11: What property of addition says $a + b = b + a$ (you can switch addends)?

Answer: Commutative property of addition. Order doesn't matter when adding numbers.

Flashcard 12: What property says $a + 0 = a$ (adding zero does not change the number)?

Answer: Identity property of addition (zero property). Adding zero leaves any number unchanged.

Flashcard 13: Which property justifies changing $(2 + 6) + 4$ to $2 + (6 + 4)$?

Answer: Associative property of addition. Regrouping to make 10 simplifies addition.

Flashcard 14: What is $10 - 6$ if you know $6 + 4 = 10$?

Answer: $4$. Since $6 + 4 = 10$, then $10 - 6 = 4$.

Flashcard 15: What is $5 + 5 + 2$ by grouping $5 + 5$ first?

Answer: $12$. First add $5+5=10$, then $10+2=12$.

Flashcard 16: What is $5 + 7 + 3$ if you group $7 + 3$ first?

Answer: $15$. Group $7 + 3 = 10$, then $5 + 10 = 15$.

Flashcard 17: Identify the property used: $7 + 9 = 9 + 7$.

Answer: Commutative property of addition. Numbers can be added in any order.

Flashcard 18: What property of addition says $(a + b) + c = a + (b + c)$ (you can regroup addends)?

Answer: Associative property of addition. Grouping doesn't matter when adding multiple numbers.

Flashcard 19: What is $1 + 6 + 4$ using $(6 + 4)$ to make $10$?

Answer: $11$. Regroup as $1 + (6 + 4) = 1 + 10 = 11$.

Flashcard 20: Identify the property used: $(2 + 4) + 3 = 2 + (4 + 3)$.

Answer: Associative property of addition. Parentheses can be moved without changing the sum.

Flashcard 21: What is $9 + 1 + 4$ by grouping to make $10$ first?

Answer: $14$. Group $9+1=10$, then $10+4=14$.

Flashcard 22: What is $4 + 6 + 7$ using $(4 + 6)$ to make $10$?

Answer: $17$. Regroup as $(4 + 6) + 7 = 10 + 7 = 17$.

Flashcard 23: Which property justifies changing $2 + 9$ to $9 + 2$ to add more easily?

Answer: Commutative property of addition. Switching addends makes mental math easier.

Flashcard 24: What is $8 + 2 + 6$ by grouping $8 + 2$ first?

Answer: $16$. First add $8+2=10$, then $10+6=16$.

Flashcard 25: What is $2 + 6 + 4$ if you use grouping to make $10$?

Answer: $12$. Group $6 + 4 = 10$, then $2 + 10 = 12$.

Flashcard 26: What property of addition says $a + b = b + a$?

Answer: Commutative property of addition. Order doesn't matter when adding numbers.

Flashcard 27: What is $15 - 0$ using the zero property of subtraction?

Answer: $15$. Subtracting zero leaves the number unchanged.

Flashcard 28: What property of addition says $a + 0 = a$?

Answer: Additive identity property (zero property of addition). Adding zero doesn't change a number.

Flashcard 29: What is $12 - 9$ if you know $9 + 3 = 12$?

Answer: $3$. Since $9 + 3 = 12$, then $12 - 9 = 3$.

Flashcard 30: What is $3 + 8 + 2$ if you group $8 + 2$ to make $10$?

Answer: $13$. Group $8 + 2 = 10$, then $3 + 10 = 13$.

Flashcard 31: What is $6 + 9$ if you use the commutative property to think $9 + 6$?

Answer: $15$. Switching addends gives the same sum.

Flashcard 32: What is $11 - 3$ if you know $8 + 3 = 11$?

Answer: $8$. Since $8 + 3 = 11$, then $11 - 3 = 8$.

Flashcard 33: What is $4 + 9$ using the commutative property (swap the addends)?

Answer: $13$. Same as $9+4$ by swapping order.

Flashcard 34: What is $3 + 9 + 7$ using $(3 + 7)$ to make $10$?

Answer: $19$. Regroup as $(3 + 7) + 9 = 10 + 9 = 19$.

Flashcard 35: Which property justifies $7 + 0 = 7$?

Answer: Identity property of addition (zero property). Adding zero doesn't change the value.

Flashcard 36: What is $9 + 1 + 6$ if you group $9 + 1$ first?

Answer: $16$. First $9 + 1 = 10$, then $10 + 6 = 16$.

Flashcard 37: What is $8 + 2 + 6$ using $(8 + 2)$ to make $10$?

Answer: $16$. Regroup as $(8 + 2) + 6 = 10 + 6 = 16$.

Flashcard 38: What is $7 + 6$ using the commutative property (swap the addends)?

Answer: $13$. Same as $6+7$ by swapping order.

Flashcard 39: What is $7 + 3 + 5$ if you group $7 + 3$ first?

Answer: $15$. First $7 + 3 = 10$, then $10 + 5 = 15$.

Flashcard 40: What is $3 + 8$ if you know $8 + 3 = 11$?

Answer: $11$. Commutative property: order doesn't change the sum.

Flashcard 41: What is $5 + 9 + 1$ using $(9 + 1)$ to make $10$?

Answer: $15$. Regroup as $5 + (9 + 1) = 5 + 10 = 15$.

Flashcard 42: What is $9 + 5 + 1$ using $(9 + 1)$ to make $10$?

Answer: $15$. Regroup as $(9 + 1) + 5 = 10 + 5 = 15$.

Flashcard 43: What is $6 + 3 + 4$ by grouping $6 + 4$ first?

Answer: $13$. Group $6+4=10$, then $10+3=13$.

Flashcard 44: What is $7 + 8 + 3$ using $(7 + 3)$ to make $10$?

Answer: $18$. Regroup as $(7 + 3) + 8 = 10 + 8 = 18$.

Flashcard 45: Find the value: $(2 + 5) + 3$ (use the associative property to regroup).

Answer: $10$. Calculate inside parentheses first: $7+3=10$.

Flashcard 46: Identify the property used: $5 + 0 = 5$.

Answer: Additive identity property (zero property of addition). Adding zero doesn't change the value.

Flashcard 47: What is $4 + 8 + 2$ if you group $8 + 2$ to make $10$?

Answer: $14$. Group $8 + 2 = 10$, then $4 + 10 = 14$.