Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 711 · 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: 74 × 75 = 5550. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 732 + 864 = 1592. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 926 + 212 = 1138. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 500 + 382 = 879. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 19 × 87 = 1655. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 990 + 921 = 1916. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 19 × 79 = 1503. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 299 + 903 = 1202. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 214 + 256 = 467. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 37 × 26 = 967. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 851 + 416 = 1266. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 195 + 363 = 558. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 29 = 464. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 626 + 758 = 1387. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 559 + 358 = 925. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 42 × 92 = 3864. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 86 × 72 = 6192. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 967 + 483 = 1455. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 886 + 389 = 1276. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 33 × 93 = 3074. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 18 × 49 = 882. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 164 + 227 = 399. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 89 × 61 = 5426. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 23 × 71 = 1630. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 60 × 61 = 3660. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 73 × 90 = 6577. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 445 + 277 = 722. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 28 × 86 = 2404. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 85 × 51 = 4335. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 54 × 56 = 3025. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 193 + 975 = 1174. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 74 × 47 = 3478. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 756 + 170 = 926. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 15 × 41 = 615. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 679 + 740 = 1419. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 56 × 91 = 5096. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 344 + 135 = 479. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 71 × 28 = 1988. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 29 × 50 = 1450. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 852 + 193 = 1045. Correct or wrong? (a) wrong (b) correct

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