Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 328 · 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: 90 × 18 = 1621. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 414 + 315 = 731. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 829 + 154 = 983. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 80 × 90 = 7200. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 95 × 95 = 9025. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 82 × 55 = 4510. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 58 × 62 = 3596. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 745 + 393 = 1131. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 26 × 61 = 1586. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 744 + 535 = 1274. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 70 × 93 = 6510. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 267 + 611 = 870. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 314 + 686 = 1005. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 793 + 394 = 1187. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 901 + 250 = 1159. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 61 × 29 = 1764. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 900 + 146 = 1046. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 65 × 22 = 1430. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 48 × 20 = 960. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 72 × 81 = 5832. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 42 × 98 = 4116. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 87 × 36 = 3137. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 643 + 651 = 1294. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 50 × 84 = 4200. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 59 × 16 = 944. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 38 × 69 = 2627. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 82 × 19 = 1564. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 301 + 226 = 527. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 30 × 17 = 510. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 573 + 497 = 1073. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 99 × 92 = 9108. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 622 + 502 = 1124. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 93 × 41 = 3813. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 279 + 826 = 1100. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 27 × 37 = 999. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 138 + 219 = 363. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 77 × 66 = 5075. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 591 + 519 = 1116. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 16 × 71 = 1136. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 48 × 12 = 575. Correct or wrong? (a) correct (b) wrong

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