Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 215 · 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: 16 × 83 = 1328. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 13 = 195. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 303 + 207 = 510. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 90 × 21 = 1896. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 55 = 990. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 39 × 13 = 507. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 81 × 97 = 7860. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 971 + 888 = 1859. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 32 × 70 = 2240. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 269 + 441 = 710. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 898 + 537 = 1435. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 92 × 15 = 1377. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 615 + 564 = 1176. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 85 × 76 = 6460. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 139 + 346 = 485. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 259 + 251 = 510. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 15 × 31 = 472. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 434 + 373 = 804. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 55 × 15 = 832. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 749 + 890 = 1639. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 67 × 46 = 3080. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 564 + 199 = 766. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 235 + 714 = 949. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 580 + 999 = 1579. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 649 + 465 = 1114. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 314 + 252 = 566. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 42 × 73 = 3074. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 79 × 13 = 1027. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 315 + 858 = 1177. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 63 × 95 = 5988. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 86 × 57 = 4905. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 74 × 13 = 962. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 214 + 864 = 1086. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 813 + 809 = 1622. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 82 × 91 = 7462. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 416 + 368 = 784. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 865 + 582 = 1445. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 70 × 76 = 5320. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 35 × 58 = 2030. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 167 + 268 = 435. Correct or wrong? (a) correct (b) wrong

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