Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 18 · 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: 791 + 547 = 1338. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 822 + 191 = 1016. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 847 + 752 = 1597. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 850 + 523 = 1371. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 88 × 87 = 7657. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 464 + 870 = 1334. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 63 × 24 = 1520. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 91 × 73 = 6643. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 93 × 36 = 3348. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 603 + 354 = 960. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 992 + 510 = 1502. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 792 + 981 = 1775. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 36 = 2885. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 96 × 35 = 3360. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 44 × 31 = 1364. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 608 + 168 = 768. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 55 × 88 = 4840. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 12 × 22 = 268. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 37 × 76 = 2812. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 12 × 24 = 287. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 522 + 675 = 1200. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 131 + 632 = 763. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 949 + 746 = 1689. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 531 + 992 = 1523. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 502 + 768 = 1265. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 25 × 29 = 725. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 82 = 1148. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 813 + 311 = 1121. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 208 + 396 = 604. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 144 + 167 = 311. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 18 × 83 = 1494. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 66 × 19 = 1254. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 35 × 74 = 2590. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 80 × 94 = 7517. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 675 + 427 = 1102. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 48 × 71 = 3401. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 374 + 667 = 1033. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 93 = 1398. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 684 + 394 = 1079. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 20 × 72 = 1440. Correct or wrong? (a) correct (b) wrong

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