Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 422 · 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: 26 × 17 = 442. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 78 × 30 = 2340. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 534 + 598 = 1132. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 696 + 691 = 1387. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 29 × 72 = 2088. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 71 × 73 = 5180. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 554 + 806 = 1355. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 43 × 18 = 777. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 26 × 65 = 1690. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 72 × 84 = 6049. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 451 + 811 = 1262. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 28 × 76 = 2128. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 17 × 87 = 1479. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 58 × 38 = 2204. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 127 + 950 = 1078. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 79 × 60 = 4740. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 54 × 57 = 3078. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 70 × 46 = 3220. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 229 + 193 = 429. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 975 + 585 = 1560. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 82 × 33 = 2706. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 871 + 620 = 1490. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 21 × 17 = 350. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 351 + 441 = 790. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 52 × 64 = 3328. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 65 × 59 = 3834. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 85 = 3145. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 865 + 584 = 1450. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 462 + 265 = 727. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 388 + 612 = 1000. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 34 × 16 = 545. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 454 + 369 = 825. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 599 + 226 = 825. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 80 = 1448. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 905 + 911 = 1816. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 270 + 287 = 557. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 17 × 83 = 1415. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 69 × 80 = 5521. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 40 × 37 = 1473. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 663 + 193 = 856. Correct or wrong? (a) wrong (b) correct

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