Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 93 · 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: 864 + 256 = 1120. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 69 × 81 = 5589. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 91 × 49 = 4464. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 631 + 142 = 765. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 15 × 30 = 450. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 875 + 516 = 1391. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 573 + 578 = 1151. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 41 × 23 = 940. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 22 × 28 = 616. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 688 + 826 = 1514. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 38 × 84 = 3192. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 898 + 469 = 1367. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 71 = 2698. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 40 × 15 = 606. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 25 × 53 = 1325. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 66 × 34 = 2244. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 23 × 64 = 1473. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 31 × 93 = 2879. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 136 + 549 = 683. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 442 + 744 = 1178. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 926 + 950 = 1884. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 89 × 89 = 7921. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 74 × 54 = 4004. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 33 × 73 = 2409. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 88 × 70 = 6153. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 258 + 638 = 893. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 75 = 2174. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 687 + 790 = 1477. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 75 × 66 = 4950. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 99 × 82 = 8125. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 87 × 29 = 2523. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 261 + 884 = 1145. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 17 × 17 = 292. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 90 × 55 = 4950. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 64 × 87 = 5569. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 98 = 5978. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 338 + 832 = 1170. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 17 × 97 = 1649. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 98 = 6762. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 927 + 390 = 1317. Correct or wrong? (a) correct (b) wrong

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