Multiply by 9 and 99 Worksheet
The trick (Ekanyunena Purvena): Write the number with as many digits as there are nines (add zeros in front if needed). Left part: the number minus 1. Right part: “all from 9 and the last from 10” of the number. More digits than the nines (237 × 99)? Split off as many digits as there are nines (2 | 37): left = number − (front part + 1) = 234, right = complement of 37 = 63 → 23463.
NameDateTime takenScore ___ / 40
- 1.78 × 99 =
- 2.18772 × 999 =
- 3.871 × 999 =
- 4.222 × 999 =
- 5.11664 × 999 =
- 6.458 × 99 =
- 7.21 × 99 =
- 8.241 × 9 =
- 9.491 × 999 =
- 10.552 × 99 =
- 11.7 × 9 =
- 12.674 × 999 =
- 13.2 × 9 =
- 14.2658 × 99 =
- 15.2 × 9 =
- 16.3911 × 999 =
- 17.74 × 99 =
- 18.2 × 9 =
- 19.23 × 999 =
- 20.92 × 99 =
- 21.164 × 9 =
- 22.17775 × 999 =
- 23.48 × 99 =
- 24.44 × 99 =
- 25.2165 × 99 =
- 26.967 × 999 =
- 27.1523 × 99 =
- 28.6 × 9 =
- 29.854 × 999 =
- 30.16 × 99 =
- 31.119 × 999 =
- 32.131 × 9 =
- 33.3 × 9 =
- 34.51 × 99 =
- 35.2 × 9 =
- 36.8 × 9 =
- 37.203 × 99 =
- 38.12935 × 999 =
- 39.7 × 9 =
- 40.674 × 999 =
Answer key
- 7722
- 18753228
- 870129
- 221778
- 11652336
- 45342
- 2079
- 2169
- 490509
- 54648
- 63
- 673326
- 18
- 263142
- 18
- 3907089
- 7326
- 18
- 22977
- 9108
- 1476
- 17757225
- 4752
- 4356
- 214335
- 966033
- 150777
- 54
- 853146
- 1584
- 118881
- 1179
- 27
- 5049
- 18
- 72
- 20097
- 12922065
- 63
- 673326
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