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 14732 divisible by 23?
- 2.Is 5731 divisible by 13?
- 3.Is 142410 divisible by 30?
- 4.Is 88440 divisible by 30?
- 5.Is 5378 divisible by 2?
- 6.Is 21689 divisible by 23?
- 7.Is 7259 divisible by 3?
- 8.Is 48835 divisible by 7?
- 9.Is 76095 divisible by 19?
- 10.Is 4981 divisible by 19?
- 11.Is 18766 divisible by 5?
- 12.Is 97331 divisible by 23?
- 13.Is 13519 divisible by 6?
- 14.Is 118617 divisible by 19?
- 15.Is 2219 divisible by 5?
- 16.Is 90450 divisible by 15?
- 17.Is 13400 divisible by 23?
- 18.Is 121684 divisible by 29?
- 19.Is 2440 divisible by 8?
- 20.Is 29446 divisible by 6?
- 21.Is 10078 divisible by 6?
- 22.Is 4398 divisible by 3?
- 23.Is 11673 divisible by 2?
- 24.Is 32150 divisible by 12?
- 25.Is 14340 divisible by 5?
- 26.Is 100943 divisible by 18?
- 27.Is 19184 divisible by 4?
- 28.Is 19796 divisible by 7?
- 29.Is 21380 divisible by 4?
- 30.Is 84502 divisible by 23?
- 31.Is 61769 divisible by 19?
- 32.Is 6456 divisible by 7?
- 33.Is 33554 divisible by 29?
- 34.Is 14582 divisible by 3?
- 35.Is 32610 divisible by 30?
- 36.Is 12900 divisible by 30?
- 37.Is 452 divisible by 8?
- 38.Is 27214 divisible by 10?
- 39.Is 129651 divisible by 23?
- 40.Is 20976 divisible by 23?
Answer key
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