Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 527 · 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: 45 × 91 = 4090. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 16 × 81 = 1296. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 14 × 20 = 280. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 86 × 13 = 1118. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 88 = 4229. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 79 × 75 = 5924. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 403 + 979 = 1382. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 823 + 249 = 1072. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 45 × 31 = 1395. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 88 = 2383. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 196 + 168 = 371. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 59 × 32 = 1896. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 34 × 33 = 1118. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 93 × 16 = 1485. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 360 + 796 = 1158. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 715 + 234 = 949. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 710 + 329 = 1043. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 30 × 21 = 632. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 365 + 211 = 576. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 421 + 572 = 995. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 58 × 48 = 2784. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 393 + 235 = 628. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 56 = 781. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 978 + 136 = 1114. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 32 × 14 = 448. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 21 × 67 = 1407. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 539 + 813 = 1349. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 80 × 45 = 3598. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 97 = 7178. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 633 + 719 = 1347. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 77 × 61 = 4702. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 82 × 61 = 5009. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 227 + 275 = 502. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 16 × 22 = 352. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 67 × 83 = 5565. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 31 × 38 = 1178. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 678 + 913 = 1588. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 95 × 78 = 7410. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 68 × 66 = 4488. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 329 + 565 = 894. Correct or wrong? (a) wrong (b) correct

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