Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 59 · 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: 80 × 60 = 4795. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 46 × 18 = 830. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 961 + 252 = 1216. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 519 + 577 = 1096. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 546 + 588 = 1130. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 91 = 3738. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 90 × 21 = 1890. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 819 + 660 = 1484. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 91 = 5369. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 54 = 2479. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 24 × 30 = 722. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 142 + 724 = 859. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 657 + 743 = 1400. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 52 × 62 = 3226. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 818 + 126 = 948. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 722 + 872 = 1599. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 17 × 35 = 595. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 199 + 675 = 868. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 407 + 201 = 610. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 21 × 45 = 945. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 295 + 828 = 1117. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 284 + 285 = 570. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 38 × 95 = 3610. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 77 × 77 = 5924. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 29 × 84 = 2442. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 20 × 72 = 1440. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 492 + 676 = 1169. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 26 × 14 = 363. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 413 + 218 = 631. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 328 + 227 = 548. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 40 × 20 = 800. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 912 + 253 = 1165. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 35 × 86 = 3017. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 872 + 997 = 1877. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 61 × 47 = 2867. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 86 × 59 = 5067. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 861 + 122 = 982. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 79 × 42 = 3324. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 98 × 51 = 4998. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 748 + 358 = 1112. Correct or wrong? (a) wrong (b) correct

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