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