Divisibility Rules Worksheet
The trick (Ekadhikena Purvena): 2, 5, 10: the last digit (even; 0 or 5; 0). 3 and 9: add the digits. 4: the last two digits. 8: the last three digits. 6: even and passes the rule for 3. 11: from the right, add the 1st, 3rd, 5th… digits and the 2nd, 4th… digits; the difference must be 0 or a multiple of 11. Any prime p: multiply p by 1, 3, 7 or 9 so it ends in 9; one more than the digits before the 9 is the osculator (7 → 5, 13 → 4, 17 → 12, 19 → 2, 23 → 7, 29 → 3). Take the last digit × the osculator and add it to the rest; repeat until the number is small and check the times table. Composite numbers: split into two factors that share no factor and pass BOTH rules — 6 = 2 × 3, 12 = 3 × 4, 15 = 3 × 5, 18 = 2 × 9, 20 = 4 × 5, 24 = 3 × 8, 30 = 3 × 10.
- 1.Is 52119 divisible by 23?
- 2.Is 14929 divisible by 17?
- 3.Is 47842 divisible by 10?
- 4.Is 58464 divisible by 24?
- 5.Is 118351 divisible by 19?
- 6.Is 3240 divisible by 12?
- 7.Is 31932 divisible by 7?
- 8.Is 12118 divisible by 2?
- 9.Is 124410 divisible by 30?
- 10.Is 6363 divisible by 5?
- 11.Is 4054 divisible by 7?
- 12.Is 26231 divisible by 5?
- 13.Is 9490 divisible by 13?
- 14.Is 69856 divisible by 10?
- 15.Is 123678 divisible by 18?
- 16.Is 579 divisible by 6?
- 17.Is 37642 divisible by 10?
- 18.Is 2799 divisible by 3?
- 19.Is 60624 divisible by 17?
- 20.Is 21296 divisible by 10?
- 21.Is 8101 divisible by 4?
- 22.Is 111282 divisible by 17?
- 23.Is 32214 divisible by 13?
- 24.Is 61378 divisible by 11?
- 25.Is 47898 divisible by 18?
- 26.Is 77841 divisible by 19?
- 27.Is 13567 divisible by 2?
- 28.Is 113904 divisible by 18?
- 29.Is 166880 divisible by 30?
- 30.Is 86059 divisible by 19?
- 31.Is 25096 divisible by 6?
- 32.Is 7047 divisible by 2?
- 33.Is 6311 divisible by 5?
- 34.Is 18162 divisible by 3?
- 35.Is 25531 divisible by 7?
- 36.Is 1681 divisible by 2?
- 37.Is 2108 divisible by 5?
- 38.Is 120953 divisible by 18?
- 39.Is 7283 divisible by 2?
- 40.Is 70195 divisible by 24?
Answer key
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