DIVIDING BY HEART (WITH 10, 100
AND 1 000)
1. How we get the quotients 9, 8, 7, 6?
9 = 90 : 10 = 81 : 9 = 72 : 8 = 63 : 7 = 54 : 6 = 45 : 5 = 36 : 4 = 27 : 3 = = 18 : 2 = 9
: 9
8 =
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7 =
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6 =
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2. Check the quotients with multiplying
Example: 70 : 10 = 7, because 7 · 10 = 70; 400 : 100 = 4, because 4 x 100 = 400
| 60 : 10 = ................................... 300 : 10 = ................................... 420 : 10 = ................................... 1 230 : 10 = ................................... 54 230 : 10 = ................................... |
600 : 100 = ..................................... 3 700 : 100 = ..................................... 6 000 : 100 = ..................................... 53 400 : 100 = ..................................... 1 200 : 100 = ..................................... |
3. How we divide with 1 000? Say the rules!
| 6 000 : 1 000 = 6 10 000 : 1 000 = 10 |
23 000 : 1 000 = 23 178 000 : 1 000 = 173 |
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4. Calculate by heart!