Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 356 · 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: 688 + 374 = 1062. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 882 + 412 = 1297. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 163 + 149 = 312. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 929 + 810 = 1739. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 727 + 268 = 995. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 48 × 65 = 3115. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 188 + 761 = 949. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 18 × 39 = 703. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 43 × 85 = 3653. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 24 × 26 = 616. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 565 + 996 = 1561. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 19 × 92 = 1742. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 358 + 561 = 919. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 16 × 51 = 816. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 579 + 284 = 863. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 609 + 344 = 960. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 124 + 249 = 370. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 343 + 510 = 853. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 608 + 966 = 1574. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 47 = 3995. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 64 × 59 = 3776. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 787 + 252 = 1039. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 42 × 79 = 3318. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 65 × 43 = 2795. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 81 × 22 = 1788. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 75 × 63 = 4725. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 84 × 75 = 6303. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 234 + 524 = 758. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 401 + 208 = 607. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 16 × 21 = 336. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 613 + 519 = 1132. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 44 = 3076. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 639 + 351 = 990. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 23 × 18 = 414. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 300 + 336 = 630. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 12 × 44 = 528. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 66 × 63 = 4158. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 23 × 56 = 1291. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 56 × 14 = 786. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 95 × 67 = 6359. Correct or wrong? (a) wrong (b) correct

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