Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 672 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 13 × 52 = 676. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 45 = 4005. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 544 + 247 = 789. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 831 + 142 = 976. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 93 × 91 = 8463. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 12 × 27 = 324. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 81 × 78 = 6313. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 75 × 68 = 5094. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 44 × 99 = 4363. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 270 + 470 = 739. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 73 × 72 = 5264. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 234 + 305 = 539. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 793 + 410 = 1207. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 775 + 583 = 1365. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 85 × 27 = 2295. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 77 × 82 = 6314. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 52 = 2912. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 27 × 52 = 1404. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 95 × 34 = 3228. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 133 + 321 = 457. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 58 × 17 = 992. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 66 × 49 = 3234. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 93 × 19 = 1767. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 290 + 492 = 778. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 43 × 92 = 3956. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 907 + 628 = 1527. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 79 × 90 = 7106. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 30 × 62 = 1866. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 69 × 21 = 1449. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 435 + 728 = 1170. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 22 × 61 = 1342. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 48 = 624. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 41 × 46 = 1890. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 88 × 54 = 4758. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 13 × 42 = 552. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 13 × 88 = 1146. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 84 × 53 = 4447. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 79 × 63 = 4979. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 63 × 54 = 3403. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 654 + 685 = 1343. Correct or wrong? (a) correct (b) wrong

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