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Memorandum
1.1 last 0 falls away
each number moves 1 place to the right
1.2 last 2 naughts falls away
each number moves 2 places to the right
1.3 last 3 noughts falls away
each number moves 3 places to the right
1.4 last 4 noughts falls away
each number moves 4 places to the right
7.
7.1 38 | 380 | 3 800 | 38 000 |
7.2 12 | 120 | 1 200 | 12 000 |
7.3 9 | 90 | 900 | 9 000 |
7.4 4 | 40 | 400 | 4 000 |
7.5 ½ / 0,5 | 5 | 50 | 500 |
As with multiplication, there are particular rules for division by multiples of 10, that enable you to calculate answers in a flash – without using pencil and paper! You have to form groups of three learners for the following activity.
1. See if you can formulate rules for the following:
2. Division by 10: __________________________________________________
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3. Division by 100: _________________________________________________
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4. Division by 1 000: ________________________________________________
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5. Division by 10 000: _______________________________________________
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6. Compare your answers with those of the class!
7. How quickly can YOU write down the answers to the following without using a calculator?
NUMBER | ÷ 10 000 | ÷ 1 000 | ÷ 100 | ÷ 10 | |
E.g. | 560 000 | 56 | 560 | 5 600 | 56 000 |
7.1 | 380 000 | ....................... | ....................... | ....................... | ....................... |
7.2 | 120 000 | ....................... | ....................... | ....................... | ....................... |
7.3 | 90 000 | ....................... | ....................... | ....................... | ....................... |
7.4 | 40 000 | ....................... | ....................... | ....................... | ....................... |
7.5 | 5 000 | ....................... | ....................... | ....................... | ....................... |
Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.
Assessment Standard 1.12: We know this when the learner recognises, describes and uses:
1.12.1: divisibility rules for 2, 5, 10, 100 and 1 000.
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