Multiplying, dividing and mixed operations · Ages 8–9

Multiplying three numbers worksheet

Part of: Multiplying by a one-digit number

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Multiplying, dividing and mixed operations · Ages 8–9

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 box of paper-wrapped cakes has 5 rows of 3. How many paper-wrapped cakes are there in 4 boxes?
Working:
Answer:
14.Ballpoint pens cost $8 each, and a box holds 7. Tsz-ching's mum buys 2 boxes. How much does she pay?
Working:
Answer:
15.A building has 34 floors, 6 flats on each floor and 2 windows in each flat. How many windows does it have?
Working:
Answer:
16.Tsz-hin skips 60 times a day, 5 days a week. How many skips is that in 2 weeks?
Working:
Answer:
17.Ka-yee skips 60 times a day, 6 days a week. How many skips is that in 3 weeks?
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Answer:
18.A building has 23 floors, 5 flats on each floor and 5 windows in each flat. How many windows does it have?
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Answer:

Show the answers and working

Multiplying three numbers worksheet: Answers and working

1. 12
Work left to right: 3 × 2 first, then multiply that by 2.
Left to right: 3 × 2 = 6, 6 × 2 = 12, so the answer is 12.
2. 162
Work left to right: 2 × 9 first, then multiply by 9.
Left to right: 2 × 9 = 18, 18 × 9 = 162.
3. 144
Work left to right: 8 × 6 first, then multiply by 3.
Left to right: 8 × 6 = 48, 48 × 3 = 144.
4. 48, 96
Work out the first two, 8 × 6, then multiply by 2.
First 8 × 6 = 48, then 48 × 2 = 96.
5. 40
Look for the easy pair first: what is 5 × 2?
Do the easy pair first: 5 × 2 = 10, then 4 × 10 = 40.
6. 56, 112
Work out the first two, 8 × 7, then multiply by 2.
First 8 × 7 = 56, then 56 × 2 = 112.
7. 1827
Work out 29 × 9 first, or 9 × 7: pick whichever order is easier.
29 × 9 = 261, 261 × 7 = 1827.
8. 288
Work out 16 × 9 first, or 9 × 2: pick whichever order is easier.
16 × 9 = 144, 144 × 2 = 288.

9. False
You can do the last two first. What is 2 × 9? Then compare with 11.
You can do 2 × 9 = 18 first, so 3 × 2 × 9 = 3 × 18.
10. C. 9 × 4 × 9
You can multiply in any order and get the same product. Which calculation still multiplies these three numbers?
Multiplying in another order gives the same product: 9 × 4 × 9 = 324.
11. A. 7 × 9 × 3
You can multiply in any order and get the same product. Which calculation still multiplies these three numbers?
Multiplying in another order gives the same product: 7 × 9 × 3 = 189.
12. False
You can do the last two first. What is 9 × 2? Then compare with 11.
You can do 9 × 2 = 18 first, so 9 × 9 × 2 = 9 × 18.

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

13. 60 paper-wrapped cakes
Work out one box first: 5 rows of 3. Then think about 4 boxes.
5 × 3 × 4 = 60.
14. 112 dollars
Work out one box first: 7 pens at $8 each. Then multiply by 2 boxes.
8 × 7 × 2 = 112.
15. 408 windows
Work out one floor first: 6 flats with 2 windows each. Then multiply by the 34 floors.
34 × 6 × 2 = 408.
16. 600 skips
Work out one week first: 60 skips a day for 5 days. Then think about 2 weeks.
60 × 5 × 2 = 600.
17. 1080 skips
Work out one week first: 60 skips a day for 6 days. Then think about 3 weeks.
60 × 6 × 3 = 1080.
18. 575 windows
Work out one floor first: 5 flats with 5 windows each. Then multiply by the 23 floors.
23 × 5 × 5 = 575.

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