Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 715 · 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: 87 × 33 = 2866. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 26 × 41 = 1074. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 41 × 42 = 1727. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 491 + 623 = 1114. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 418 + 330 = 743. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 247 + 860 = 1107. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 28 = 894. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 91 × 59 = 5369. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 429 + 121 = 550. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 910 + 504 = 1421. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 563 + 316 = 879. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 93 × 42 = 3906. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 22 × 71 = 1554. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 164 + 278 = 442. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 790 + 929 = 1713. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 148 + 802 = 950. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 39 × 87 = 3393. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 19 × 50 = 950. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 90 × 13 = 1162. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 303 + 947 = 1250. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 353 + 148 = 501. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 98 × 15 = 1470. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 31 × 47 = 1457. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 49 = 1026. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 26 × 69 = 1798. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 595 + 353 = 948. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 133 + 644 = 777. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 39 × 95 = 3698. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 60 × 14 = 840. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 64 × 52 = 3320. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 527 + 140 = 667. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 131 + 944 = 1070. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 53 = 1597. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 259 + 608 = 867. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 79 × 29 = 2291. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 57 × 25 = 1425. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 150 + 856 = 1006. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 35 × 59 = 2059. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 723 + 135 = 858. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 22 × 43 = 946. Correct or wrong? (a) wrong (b) correct

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