Multiplying, dividing and mixed operations · Ages 9–10

Multiplying by 10, by 100 and by whole tens worksheet

Part of: Multiplying and dividing by two digits; divisibility

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Multiplying, dividing and mixed operations · Ages 9–10

Numsprite
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Name:Date:Score:／48

Write each answer in the space. For word problems, show your working and write a sentence answer.

13.A crate holds 40 cans of drink. How many cans are there in 40 crates?
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Answer:
14.Chi-keung skips 57 times a day. How many skips is that in 60 days?
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Answer:
15.A cinema has 13 rows of 14 seats. How many seats are there?
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Answer:
16.Tsz-hin saves $58 a week for 70 weeks, then spends $310 on a toy. How much is left?
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Answer:
17.Concert tickets cost $60 each, and 500 are sold. How much money do the tickets bring in?
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18.A crate holds 32 cans of drink. How many cans are there in 30 crates?
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Answer:

Show the answers and working

Multiplying by 10, by 100 and by whole tens worksheet: Answers and working

1. 58, 580
Work out 29 × 2 first; times 10 then just puts a 0 on the end.
20 is 2 tens: 29 × 2 = 58, then times 10 makes 580.
2. 5380
Times 10: how many places does each digit of 538 move left, and how many 0s go on the end?
Times 10, the digits move left and 0s go on the end: 5380.
3. 3480
Times 10: how many places does each digit of 348 move left, and how many 0s go on the end?
Times 10, the digits move left and 0s go on the end: 3480.
4. 1950
50 is 5 tens: work out 39 × 5 first, then put a 0 on the end.
39 × 5 = 195, then a 0 on the end: 1950.
5. 49500
500 is 5 hundreds: work out 99 × 5 first, then put two 0s on the end.
99 × 5 = 495, then two 0s on the end: 49500.
6. 1080, 72, 1152
96 splits into 90 and 6. Start with 12 × 90: 12 × 9, then a 0 on the end.
Split 96 = 90 + 6: 12 × 90 = 1080, 12 × 6 = 72, 1080 + 72 = 1152.
7. 3600
60 is 6 tens: work out 60 × 6 first, then put a 0 on the end.
60 × 6 = 360, then a 0 on the end: 3600.
8. 1750, 200, 1950
78 splits into 70 and 8. Start with 25 × 70: 25 × 7, then a 0 on the end.
Split 78 = 70 + 8: 25 × 70 = 1750, 25 × 8 = 200, 1750 + 200 = 1950.
9. 30
□ is some number of tens. Try it: 14 times what, then times 10, makes 420?
420 ÷ 14 = 30. Check: 14 × 30 = 420.
10. 40
□ is some number of tens. Try it: 81 times what, then times 10, makes 3240?
3240 ÷ 81 = 40. Check: 81 × 40 = 3240.

11. False
Work out 38 × 6, put a 0 on the end, and see whether that matches 228.
38 × 6, then times 10: 38 × 60 = 2280.
12. False
Work out 23 × 9, put a 0 on the end, and see whether that matches 20700.
23 × 9, then times 10: 23 × 90 = 2070.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 1600 cans
You need 40 × 40: work out 40 × 4 first, then put a 0 on the end.
40 × 40 = 40 × 4 × 10 = 1600.
14. 3420 skips
You need 57 × 60: work out 57 × 6 first, then put a 0 on the end.
57 × 60: 57 × 6 first, then a 0 on the end: 3420.
15. 182 seats
The seats are 13 × 14. Split 13 into tens and ones and multiply each by 14.
Split 13 into tens and ones, multiply each by 14 and add: 182.
16. 3750 dollars
First work out how much is saved in 70 weeks (58 × 70), then subtract the toy's price.
Saved 58 × 70 = 4060, and 4060 − 310 = 3750.
17. 30000 dollars
Money in = price × tickets sold. 500 is 5 hundreds: work out 60 × 5, then put two 0s on the end.
60 × 500 = 60 × 5 × 100 = 30000.
18. 960 cans
You need 32 × 30: work out 32 × 3 first, then put a 0 on the end.
32 × 30 = 32 × 3 × 10 = 960.

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