Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 624 · 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: 298 + 140 = 431. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 319 + 153 = 470. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 45 × 65 = 2930. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 501 + 442 = 950. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 62 = 5084. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 97 × 29 = 2813. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 74 × 18 = 1329. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 35 = 2765. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 86 × 34 = 2928. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 425 + 589 = 1008. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 942 + 935 = 1875. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 672 + 695 = 1367. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 484 + 128 = 617. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 79 × 99 = 7823. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 34 × 30 = 1020. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 698 + 854 = 1557. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 873 + 181 = 1054. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 81 × 17 = 1381. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 63 × 25 = 1575. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 639 + 842 = 1481. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 212 + 732 = 944. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 246 + 500 = 746. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 750 + 188 = 938. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 357 + 143 = 504. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 992 + 306 = 1305. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 371 + 757 = 1128. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 61 × 84 = 5123. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 64 × 12 = 768. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 508 + 252 = 760. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 95 × 19 = 1805. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 331 + 531 = 865. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 469 + 726 = 1195. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 26 = 519. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 34 × 55 = 1870. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 687 + 730 = 1417. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 92 × 55 = 5062. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 72 × 98 = 7048. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 34 × 27 = 918. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 86 × 94 = 8076. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 201 + 257 = 458. Correct or wrong? (a) correct (b) wrong

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