2.OA.1 bellringer/DG

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What is an addition keyword?

Back

An addition keyword is a word that indicates you need to add numbers together. Examples include 'sum' and 'more.'

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CCSS.4.OA.A.3

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What does 'sum' mean in math?

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The 'sum' is the result of adding two or more numbers together.

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CCSS.5.OA.A.1

CCSS.5.OA.A.2

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If Ben had 3 grapefruits and Owen gave him 7 more, how many grapefruits does Ben have now?

Back

10 grapefruits

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CCSS.1.OA.A.1

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If Jason had 4 marbles and found 9 more, how many marbles does he have now?

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13 marbles

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CCSS.2.OA.A.1

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What is subtraction?

Back

Subtraction is taking one number away from another. It is the opposite of addition.

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CCSS.2.OA.A.1

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What does 'difference' mean in math?

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The 'difference' is the result of subtracting one number from another.

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CCSS.5.OA.A.1

CCSS.5.OA.A.2

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If there are 10 boys and 5 girls in a class, how many children are there in total?

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15 children

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CCSS.2.OA.A.1

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If 8 children leave a class of 15, how many children are left?

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7 children

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CCSS.2.OA.A.1

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Sophie had 15 crayons and gave 5 to Caleb. How many crayons does she have now?

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10 crayons

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CCSS.2.OA.A.1

Front

What is the equation for adding two numbers?

Back

The equation is written as: a + b = c, where a and b are the numbers being added, and c is the sum.

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