Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 998 · 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: 95 × 12 = 1142. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 919 + 238 = 1153. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 245 + 974 = 1218. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 82 = 4014. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 53 × 32 = 1691. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 14 × 27 = 380. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 263 + 350 = 621. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 202 + 609 = 811. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 38 × 12 = 456. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 33 × 13 = 428. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 368 + 189 = 552. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 71 × 46 = 3262. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 145 + 958 = 1103. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 590 + 592 = 1182. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 323 + 961 = 1279. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 509 + 199 = 707. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 34 × 39 = 1326. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 373 + 191 = 571. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 46 × 45 = 2071. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 696 + 461 = 1159. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 82 × 92 = 7544. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 391 + 285 = 676. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 89 × 79 = 7037. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 511 + 608 = 1116. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 198 + 138 = 335. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 94 × 63 = 5922. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 25 × 63 = 1575. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 45 × 75 = 3375. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 489 + 842 = 1331. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 47 = 4230. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 902 + 754 = 1657. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 73 × 85 = 6205. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 14 = 420. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 324 + 541 = 872. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 74 × 62 = 4595. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 53 × 96 = 5092. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 23 × 60 = 1381. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 54 × 76 = 4103. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 63 = 1386. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 32 × 90 = 2882. Correct or wrong? (a) wrong (b) correct

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