Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 220 · 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: 234 + 729 = 963. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 498 + 614 = 1104. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 78 × 90 = 7028. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 98 = 3717. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 72 × 53 = 3820. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 328 + 579 = 907. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 81 × 19 = 1539. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 215 + 335 = 558. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 24 = 1800. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 70 × 73 = 5110. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 58 × 44 = 2555. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 966 + 196 = 1162. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 15 × 48 = 716. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 997 + 920 = 1910. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 130 + 522 = 650. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 826 + 668 = 1494. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 57 = 684. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 740 + 914 = 1654. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 323 + 856 = 1179. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 318 + 637 = 955. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 36 × 58 = 2088. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 423 + 382 = 805. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 410 + 441 = 851. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 598 + 477 = 1075. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 66 × 17 = 1122. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 85 × 13 = 1112. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 313 + 854 = 1168. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 204 + 383 = 587. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 998 + 284 = 1282. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 228 + 751 = 979. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 71 × 28 = 1995. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 585 + 718 = 1303. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 31 × 19 = 585. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 853 + 227 = 1080. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 19 × 56 = 1064. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 19 × 50 = 949. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 66 × 50 = 3303. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 236 + 391 = 629. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 48 × 12 = 573. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 88 × 71 = 6245. Correct or wrong? (a) correct (b) wrong

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