Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 160 · 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: 31 × 69 = 2147. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 13 × 48 = 624. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 44 × 66 = 2910. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 448 + 563 = 1008. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 285 + 527 = 808. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 23 × 77 = 1774. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 35 × 70 = 2450. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 24 × 81 = 1950. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 53 × 82 = 4354. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 823 + 684 = 1501. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 209 + 490 = 700. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 20 × 78 = 1560. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 578 + 276 = 852. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 56 × 38 = 2128. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 801 + 597 = 1398. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 59 × 12 = 708. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 40 × 79 = 3160. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 86 × 62 = 5332. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 36 × 40 = 1437. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 37 × 78 = 2891. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 49 × 39 = 1913. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 26 × 12 = 312. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 356 + 748 = 1104. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 63 × 89 = 5607. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 465 + 446 = 905. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 50 × 53 = 2646. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 335 + 983 = 1318. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 42 × 93 = 3906. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 15 × 29 = 442. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 197 + 795 = 1000. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 63 = 1575. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 845 + 122 = 975. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 359 + 582 = 941. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 84 × 92 = 7728. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 852 + 181 = 1031. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 637 + 330 = 965. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 98 × 83 = 8134. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 50 × 84 = 4203. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 35 × 52 = 1820. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 292 + 623 = 917. Correct or wrong? (a) wrong (b) correct

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