PS RU P4L38 Four Operations of Decimals WS (Errata) solution

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Topic Four Operations of Decimals (Lesson 38)

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Primary 4: Rev Up! Math

Dear Earthlings,
We are under attack by the aliens, the Smocks! Help us by
completing Mission 1 and 2. The number of correct answers
in these missions will determine the number of spaceships
we manage to send into the galaxy as reinforcement.

Mission 1: Add the following decimals and write the answers in the spaceships.

1a. Working
9.95 + 5

1b.
4.2 + 19.36

1c.
23.69 + 448.89

1d.
789.99 + 999.99

Remember to check your work! 1

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Primary 4: Rev Up! Math

Mission 2: Subtract the following decimals and write the answers in the
spaceships.

2a. Working
8 – 3.19

2b.
11.10 – 2.9

2c.
201.07 – 12.19

2d.
410.10 – 171.29

How many spaceships did you manage to send into the
galaxy?

spaceships

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Primary 4: Rev Up! Math

Oh no! We are out of power cubes to power our spaceships.
Help us by completing Mission 3 and 4. The number of correct
answers in these missions will determine the number of cubes
we manage to collect.

Mission 3: Multiply and write your answers in the cubes.

3a. Working
90.7 x 8

3b.
0.78 x 7

3c.
29.75 x 5

3d. 3
18.98 x 9

3e.
112.79 x 6

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Mission 4: Divide and write your answers in the boxes.

4a. Working

3 =3÷8= 8) 3
8

4b.
45 ÷ 8 =

4c. 4
701.309 ÷ 7 ≈

4d.
Express 283 as a decimal.

You must be tired now. Hang on! The more
power cubes we get, the longer our spaceships
can travel.

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Primary 4: Rev Up! Math

Mission 4: Divide and correct your answers to 2 decimal places. Write your
answers in the boxes.

4e. Working

2 =2÷3=
3
≈

4f.

48 ÷ 9 =
≈

4g.

Express 23 as a decimal
6

4h. 5
Express 681 as a decimal

4i.
100 ÷ 9 =
≈

How many power cubes did you manage to
collect?

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Primary 4: Rev Up! Math

Mission 5: Solve the following problem sums and show all workings
clearly.
5. David went to a bookshop. He bought a book for $24.95 and 4 pens at $3.80

each.
a) How much did he spend on the book and the pens?

b) If he gave the cashier a $50 note, how much change did he receive?

6. A tank has a capacity of 57 litres of water. Jim filled the tank with 4 bottles of
water. What is the capacity of each bottle of water?

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Primary 4: Rev Up! Math

7. Mrs Tan bought 7 Mathematics guide books and 3 Science guide books for
her pupils. A Science guide book cost $4 more than a Mathematics guide
book. If Mrs Tan spent $100 on all the books, how much did one
Mathematics guide book and one Science guide book cost in total?

8. The mass of a tank filled with sand is 10.48 kg.
The mass of the same tank filled with water is 3.58 kg.
If the mass of the sand is 4 times as heavy as the water, what is the mass of
the empty tank?

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