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Discover 2 Unit 7
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Which number do we usually write subtraction math problems in a row?
single- digit numbers.
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How many do you count backward when you subtract 5?
Count backward by fives
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What is subtraction problem?
When we subtract things, we take them away from other things.
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Which number do we usually write subtraction math problems in a column?
double-digit numbers
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Can you say this problem in words: 14-8= 6
Fourteen minus eight equals six.
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Now count backward by four, how much are you subtracting each time now?
I'm subtracting 4 each time.
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Ann has 36 apples. She ate 3 appples. How many apples were left?
33 apples.
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Jack has 32 cookies, but he shared with his brother 16 cookies. How many cookies were left?
16 cookies.
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What do we need in the subtraction math problems?
All subtraction math problems have a minus sign.
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What is addition problem?
When we add things, we join them together.
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