Open Number Line
Show 77-14 on an open number line.
77 is on the right end of the number line and there should be one "big" jump (-10) and 4 "little" jumps (-1). The answer is 63.
Tom had 48 baseball cards. He sold 23 of his baseball cards. How many baseball cards does he have left?
25 baseball cards
Solve this problem by using the place value chart:
50
- 34
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The final place value chart should show 1 line in the tens place and 6 circles in the ones place. The answer is 16.
Solve this problem:
68
- 42
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26
What place value is this showing: 6_
One's Place
Show 57-28 on an open number line.
57 should be on the right end of the number line and there should be 2 "big" jumps (-10) and 8 "little" jumps (-1). The answer is 29.
The teacher wants to collect 67 pencils. She has collected 39 pencils so far. How many more pencils does she need to collect?
28 pencils
Solve this problem by using the place value chart:
81
- 77
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The final place value chart should show 0 lines in the tens place and 4 circles in the ones place. The answer is 4.
Solve this problem:
77
- 29
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48
What is the term that is used to describe what you do when there is "too much on the floor?"
Go next door and REGROUP!
99 should be on the right end of the number line and there should be 5 "big" jumps (-10) and 2 "little" jumps (-1). The answer is 47.
Before the post office opened on Monday morning, there were 80 packs of stamps. At the end of the day, there were 53 packs of stamps left. How many packs of stamps were sold on Monday?
27 packs of stamps
Solve this problem by using the place value chart:
63
- 16
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The final place value chart should show 4 lines in the tens place and 7 circles in the ones place. The answer is 47.
90
- 67
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23
What is the term that is used to describe an answer to a subtraction problem?
Difference