Unit 5 Review
Show either compensation to find the answer:
99-29
99 - 29 99 - 29
+1 +1 OR +1
---------- --------
100 - 30 99 - 30 = 69 +1
ANSWER: 70
Do you need to regroup? Show your work.
68-3
NO, you do NOT need to regroup because you can take away 3 from 8.
THE ANSWER IS 65.
Carlos wants to find 48-29. How can he regroup 48?
Take a ten away from 4 tens, so it becomes 3 tens.
Add the ten to the 8 ones, so it becomes 18 ones.
Cylus has 29 Ninjago toys. He lost 6 of them. How many Ninjago toys does he have left?
29-6=
(You DO NOT need to regroup since you can take away 6 from 9)
THE ANSWER IS 23.
Go backwards on the number line to show: 85-31
<-------------------------------------------------------------------->
<-------------------------------------------------------------------->
54 (-1) 55 (-10) 65 (-10) 75 (-10) 85
ANSWER: 54
Do you need to regroup? Why? Show your work.
61-3
Yes, you do need to regroup because you can't take away 3 from 1.
5<--6 111
- 3
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THE ANSWER IS 58
Aisha has 45 stickers. She sells 19 of them. How many stickers did she NOT sell?
3 <-4 515
- 1 9
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THE ANSWER IS 26 STICKERS.
Which of these do you need to regroup? (WHY Yes or No)
□ 54 - 23
□ 82 - 44
□ 58 - 45
□ 65 - 9
□ NO, you can take away 3 from 4.
□ YES, you can't take away 4 from 2.
□ NO, you can take away 5 from 8.
□ YES, you can't take away 9 from 5.
Go forward on the number line to show 68-33:
<-------------------------------------------------------------------->
<-------------------------------------------------------------------->
33 (+10) 43 (+10) 53 (+10) 63 (+5) 68
ANSWER: 35
Do you need to regroup 83-29? Why? Show your work.
Yes, you need to regroup because you can't take away 9 from 3.
7<--8 313
- 2 9
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THE ANSWER IS 54.
Mason is building a house. He needs 94 blocks. But he has 65 blocks. How many more bricks does he need?
8 <-9 414
- 6 5
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THE ANSWER IS 29 MORE BRICKS.
Blake has 46 paper airplanes.
Lorenzo has 4 fewer paper airplanes than Blake.
Lorenzo gives 9 paper airplanes to his friend.
HOW MANY PAPER AIRPLANES DOES LORENZO HAVE NOW?
46 - 4 = 42
Lorenzo has 42 paper airplanes in the beginning.
42 - 9 = 33
Lorenzo NOW has 33 left.
THE ANSWER IS 33 PAPER AIRPLANES.
Adriel has 15 rocks. 6 of those rocks are circles. 2 are sharp. The rest are chalk rocks. How many chalk rocks does Adriel have?
6+2 = 8
15-8 = 7
ANWER: Adriel has 7 chalk rocks.
Use Partial Differences to show: 46-28
- 20 (tens)
---------
26
- 6 (8 ones)
----------
20
- 2 (8 ones)
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THE ANSWER IS 18.
Last month Paula ran 20 miles. She rank 14 miles this month. 6 of those miles she actually walked. How many miles did she NOT walk?
- 6
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THE ANSWER IS 08 miles she did NOT walk.
Adriel collected 62 Pokemon cards. Angel collected 29 Pokemon cards, and Logan collected 16. How many fewer Pokemon cards did Logan collect than Adriel?
5 <- 6 212
- 1 6
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THE ANSWER IS LOGAN HAS 46 LESS POKEMON CARDS THAN ADRIEL.