Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 796 · 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: 312 + 356 = 676. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 53 × 61 = 3238. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 62 = 988. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 794 + 462 = 1257. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 424 + 276 = 693. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 315 + 973 = 1280. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 376 + 525 = 894. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 294 + 148 = 446. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 403 + 689 = 1092. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 749 + 141 = 890. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 770 + 803 = 1573. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 35 = 557. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 21 × 84 = 1764. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 28 × 74 = 2072. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 12 × 45 = 546. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 97 × 69 = 6698. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 431 + 545 = 984. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 614 + 453 = 1067. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 400 + 166 = 566. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 13 × 20 = 262. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 848 + 534 = 1382. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 49 = 3675. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 841 + 206 = 1055. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 54 × 50 = 2698. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 654 + 276 = 930. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 42 × 44 = 1845. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 88 = 1496. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 83 = 4648. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 92 = 3399. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 37 × 51 = 1887. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 473 + 284 = 757. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 395 + 724 = 1119. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 57 × 45 = 2565. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 673 + 260 = 939. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 166 + 492 = 661. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 97 = 1267. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 762 + 838 = 1592. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 260 + 394 = 657. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 434 + 883 = 1324. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 807 + 632 = 1443. Correct or wrong? (a) correct (b) wrong

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