Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 140 · 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: 30 × 92 = 2762. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 996 + 824 = 1820. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 62 = 1922. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 52 × 20 = 1040. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 694 + 940 = 1634. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 31 × 18 = 560. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 23 × 20 = 460. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 826 + 182 = 1008. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 815 + 735 = 1550. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 94 × 48 = 4509. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 98 × 41 = 4024. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 43 × 46 = 1972. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 41 × 79 = 3234. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 280 + 539 = 812. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 279 + 186 = 470. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 651 + 830 = 1481. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 176 + 247 = 423. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 30 = 2398. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 333 + 810 = 1143. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 295 + 449 = 746. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 22 × 92 = 2024. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 26 × 50 = 1307. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 365 + 307 = 672. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 55 × 77 = 4238. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 155 + 517 = 676. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 49 × 34 = 1666. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 65 × 41 = 2658. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 280 + 527 = 803. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 901 + 217 = 1118. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 15 × 85 = 1275. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 49 = 1805. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 24 × 89 = 2136. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 14 × 27 = 379. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 35 × 45 = 1583. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 14 × 28 = 392. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 99 × 29 = 2871. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 145 + 267 = 407. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 35 × 99 = 3465. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 250 + 850 = 1092. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 18 × 82 = 1476. Correct or wrong? (a) correct (b) wrong

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