3.7 “noughts and crosses” and module test

Mathematics

Decimal fractions

Educator section

Memorandum

MODULE TETS 5

1. a) 0,68

1. 0,875
2. 0,45 (3)

2. a) 8432,17

8432,168

8432,2 (3)

3.

(4)

4. a) 523,017 (2)

1. 0,987 (3)
2. 1,34 (2)

5. 180 $$ 2,25

80 times (4)

6. 88,5 x 28,3

2 504,55 m ${}_{}^{}$ (4)

Leaner section

Content

Activity: “noughts and crosses” and module test

26. Let us play “Noughts and Crosses”!

You need a friend and a rectangle with decimal numbers as in the example.

You may also write your own decimal numbers in the blocks.

• Player 1 chooses any number on the rectangle and must say what number ÷ or × by 10, 100 or 1 000 will give that number.

e.g. 2,5 : 25 ÷ 10 = 2,5 or

0,025 ´ 100 = 2,5

• Player 2 checks with the calculator.
• If player 1 is correct, he marks his block with a x or o.
• Take turns until one of the players is the first one to get 4 x’s or o’s in a row. (horizontal, vertical or diagonal).

Module test

1. Write as a decimal fraction:

a) $\frac{\text{17}}{\text{25}}$ ..................................................

b) $\frac{7}{8}$ ..................................................

c) $\frac{9}{\text{20}}$ .................................................. (3)

2. Round off 8432,1679:

a) to 2 digits after the decimal comma: ..................................................

b) to the nearest 1 000th: ..................................................

c) to the nearest tenth: .................................................. (3)

3. Complete the table:

(4)

4. Calculate without a calculator:

a) r = 2 000 – 1476,983

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b) t = R4,70 × 0,21

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c) u = 26,80 ÷ 20

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5. How many times can a bottle with a capacity of 2,25 ℓ be filled from a 180 ℓ container?

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6. A space shuttle travels 88,5 m per second. How far will it travel in 28,3 seconds?

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