Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 327 · 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: 15 × 24 = 360. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 92 × 35 = 3213. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 883 + 211 = 1091. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 600 + 975 = 1575. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 57 × 99 = 5643. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 15 × 93 = 1398. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 635 + 145 = 780. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 62 × 40 = 2480. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 22 × 28 = 616. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 187 + 957 = 1144. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 781 + 798 = 1578. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 25 × 60 = 1500. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 763 + 142 = 912. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 45 × 80 = 3600. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 57 × 44 = 2508. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 78 = 2957. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 947 + 365 = 1312. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 61 = 1769. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 193 + 559 = 753. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 448 + 136 = 584. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 72 = 4976. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 75 = 6450. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 432 + 219 = 651. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 406 + 803 = 1207. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 136 + 638 = 774. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 479 + 321 = 803. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 803 + 492 = 1295. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 190 + 242 = 432. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 230 + 987 = 1211. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 565 + 862 = 1427. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 837 + 208 = 1045. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 751 + 266 = 1017. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 664 + 640 = 1301. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 35 × 98 = 3435. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 206 + 758 = 964. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 56 × 24 = 1343. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 99 × 18 = 1780. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 46 × 70 = 3226. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 98 × 15 = 1477. Correct or wrong? (a) wrong (b) correct

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