Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 132 · 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: 66 × 18 = 1188. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 872 + 419 = 1291. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 92 = 2944. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 71 × 14 = 994. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 20 × 76 = 1520. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 719 + 524 = 1243. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 17 × 98 = 1666. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 745 + 278 = 1023. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 90 × 66 = 5940. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 44 × 83 = 3652. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 96 × 28 = 2688. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 32 × 21 = 672. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 29 × 87 = 2523. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 67 × 67 = 4489. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 29 × 34 = 981. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 678 + 389 = 1067. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 219 + 574 = 793. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 142 + 710 = 856. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 88 × 71 = 6255. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 262 + 698 = 960. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 67 × 93 = 6223. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 378 + 555 = 933. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 65 × 74 = 4810. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 239 + 148 = 395. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 520 + 169 = 689. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 57 × 19 = 1089. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 626 + 147 = 773. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 22 × 12 = 257. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 824 + 934 = 1765. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 518 + 806 = 1317. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 99 = 1980. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 51 × 80 = 4083. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 228 + 721 = 949. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 322 + 264 = 586. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 975 + 936 = 1912. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 204 + 570 = 772. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 13 × 59 = 767. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 157 + 989 = 1150. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 61 × 77 = 4697. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 28 × 17 = 476. Correct or wrong? (a) correct (b) wrong

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