Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 966 · 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: 624 + 290 = 912. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 86 = 7649. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 53 × 40 = 2120. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 75 × 59 = 4425. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 308 + 588 = 896. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 494 + 696 = 1190. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 650 + 822 = 1467. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 65 × 44 = 2860. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 50 × 15 = 752. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 89 × 26 = 2322. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 352 + 725 = 1080. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 165 + 374 = 539. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 58 × 42 = 2436. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 309 + 243 = 552. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 416 + 551 = 967. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 613 + 893 = 1506. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 368 + 194 = 563. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 41 × 58 = 2378. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 85 = 5015. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 893 + 318 = 1209. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 623 + 424 = 1047. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 241 + 328 = 569. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 12 × 40 = 480. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 672 + 886 = 1558. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 734 + 228 = 962. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 575 + 364 = 940. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 39 × 47 = 1828. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 94 × 59 = 5546. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 67 × 32 = 2144. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 937 + 254 = 1191. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 90 × 22 = 1980. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 80 × 81 = 6480. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 23 = 552. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 50 × 27 = 1344. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 731 + 626 = 1357. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 62 = 3774. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 620 + 576 = 1192. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 86 × 96 = 8257. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 262 + 214 = 476. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 548 + 910 = 1450. Correct or wrong? (a) wrong (b) correct

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