Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 502 · 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: 852 + 836 = 1687. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 953 + 910 = 1863. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 455 + 217 = 676. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 269 + 217 = 486. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 81 × 63 = 5109. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 849 + 296 = 1145. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 37 × 66 = 2442. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 32 × 88 = 2816. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 71 × 24 = 1704. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 29 = 1453. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 746 + 308 = 1047. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 50 × 64 = 3200. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 360 + 154 = 521. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 665 + 564 = 1229. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 170 + 975 = 1145. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 832 + 820 = 1650. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 92 × 41 = 3772. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 29 × 35 = 1015. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 522 + 781 = 1299. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 489 + 708 = 1201. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 278 + 535 = 805. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 90 × 72 = 6482. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 502 + 291 = 794. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 19 × 79 = 1504. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 34 × 33 = 1129. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 691 + 370 = 1054. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 46 × 68 = 3128. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 88 × 92 = 8096. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 61 × 64 = 3899. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 49 × 77 = 3774. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 411 + 486 = 889. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 235 + 153 = 388. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 21 × 34 = 714. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 719 + 407 = 1126. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 23 × 68 = 1564. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 234 + 160 = 394. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 962 + 924 = 1880. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 582 + 887 = 1469. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 99 × 84 = 8316. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 73 = 2117. Correct or wrong? (a) wrong (b) correct

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