Addition and Subtraction to 20

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What is the Commutative Property of Addition?

Back

The Commutative Property of Addition states that changing the order of the addends does not change the sum. For example, 2 + 3 = 3 + 2.

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What is the Associative Property of Addition?

Back

The Associative Property of Addition states that the way in which numbers are grouped when adding does not change the sum. For example, (1 + 2) + 3 = 1 + (2 + 3).

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What is the identity element for addition?

Back

The identity element for addition is 0, because adding 0 to any number does not change the value of that number. For example, 5 + 0 = 5.

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How do you solve for an unknown in an addition equation?

Back

To solve for an unknown in an addition equation, you can subtract the known number from the total. For example, in the equation x + 5 = 10, you would subtract 5 from both sides to find x = 5.

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What is a double in addition?

Back

A double in addition refers to adding the same number to itself. For example, 4 + 4 is a double, which equals 8.

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What is the sum of 6 and 5?

Back

The sum of 6 and 5 is 11.

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What is the sum of three numbers: 6, 8, and 0?

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The sum of 6, 8, and 0 is 14.

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What is the relationship between addition and subtraction?

Back

Addition and subtraction are inverse operations. This means that if you know the sum, you can find one of the addends by subtracting the other addend from the sum.

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What is the concept of number sense in addition?

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Number sense in addition refers to the understanding of numbers and their relationships, which helps in making sense of mathematical operations and solving problems.

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How can you use known sums to find unknown addends?

Back

You can use known sums to find unknown addends by setting up equations based on the known relationships. For example, if you know that 9 + x = 12, you can solve for x by subtracting 9 from 12.