Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 640 · 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: 163 + 659 = 822. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 15 = 1335. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 26 × 29 = 754. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 15 = 825. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 74 × 67 = 4958. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 754 + 892 = 1648. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 50 = 1500. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 24 × 64 = 1536. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 529 + 770 = 1302. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 85 × 85 = 7223. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 148 + 322 = 470. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 62 = 6143. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 128 + 667 = 787. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 810 + 418 = 1228. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 84 × 26 = 2184. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 19 × 18 = 342. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 27 × 16 = 438. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 40 = 1726. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 335 + 559 = 897. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 839 + 314 = 1160. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 48 × 13 = 624. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 800 + 358 = 1166. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 56 × 47 = 2636. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 95 = 8455. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 96 × 68 = 6531. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 34 × 83 = 2822. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 28 = 616. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 86 × 29 = 2494. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 314 + 766 = 1073. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 43 × 15 = 642. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 48 × 36 = 1728. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 136 + 981 = 1114. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 14 = 1178. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 145 + 778 = 918. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 78 × 19 = 1474. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 234 + 520 = 754. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 502 + 206 = 708. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 31 × 60 = 1860. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 60 = 3243. Correct or wrong? (a) correct (b) wrong

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