Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 497 · 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: 663 + 962 = 1624. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 271 + 891 = 1162. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 20 × 97 = 1940. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 64 × 79 = 5056. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 87 × 33 = 2867. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 686 + 771 = 1463. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 37 × 85 = 3153. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 892 + 554 = 1446. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 482 + 981 = 1463. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 224 + 338 = 562. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 63 × 14 = 880. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 860 + 612 = 1472. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 93 × 17 = 1581. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 731 + 580 = 1318. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 421 + 548 = 969. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 540 + 778 = 1318. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 79 × 12 = 946. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 692 + 444 = 1138. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 528 + 850 = 1378. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 964 + 719 = 1683. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 38 × 20 = 764. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 59 × 89 = 5257. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 956 + 599 = 1556. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 154 + 526 = 688. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 33 × 62 = 2053. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 13 × 97 = 1261. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 49 × 42 = 2058. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 235 + 292 = 530. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 21 × 93 = 1953. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 969 + 182 = 1151. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 296 + 224 = 515. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 865 + 904 = 1773. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 24 × 61 = 1457. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 288 + 432 = 721. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 92 × 27 = 2484. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 53 × 96 = 5092. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 84 × 37 = 3112. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 639 + 687 = 1326. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 49 × 26 = 1272. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 75 × 92 = 6900. Correct or wrong? (a) correct (b) wrong

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