# 3.7 “noughts and crosses” and module test

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## 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.

 23,6489 23 648,9 0,236489 236 489

(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)

## 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

 0,9 2,2 0,45 1,4 2,5 0,08 0,91 0,17 0,007 3,6 0,168 0,024 0,14 0,98 0,016 4,1
• 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:

 Number 236,489 ÷ 10 ......................... × 100 ......................... ÷ 1 000 ......................... × 1 000 .........................

(4)

4. Calculate without a calculator:

a) r = 2 000 – 1476,983

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

b) t = R4,70 × 0,21

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (3)

c) u = 26,80 ÷ 20

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

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

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

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

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

(25)

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