Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 159 · 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: 36 × 69 = 2479. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 700 + 639 = 1332. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 232 + 694 = 926. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 410 + 285 = 690. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 633 + 220 = 853. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 999 + 757 = 1749. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 74 × 98 = 7252. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 303 + 684 = 987. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 503 + 767 = 1271. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 89 × 40 = 3566. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 754 + 291 = 1045. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 69 × 31 = 2141. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 786 + 451 = 1237. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 90 × 63 = 5670. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 76 = 4642. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 21 × 59 = 1239. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 487 + 183 = 671. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 174 + 654 = 828. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 47 × 87 = 4089. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 63 × 64 = 4031. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 849 + 443 = 1293. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 623 + 820 = 1443. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 947 + 627 = 1567. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 47 = 752. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 67 × 93 = 6226. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 71 × 94 = 6678. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 835 + 538 = 1373. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 789 + 914 = 1703. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 52 = 2971. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 33 × 39 = 1290. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 275 + 894 = 1169. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 954 + 825 = 1778. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 31 × 43 = 1333. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 588 + 210 = 798. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 251 + 145 = 396. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 91 = 5915. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 474 + 301 = 772. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 48 × 20 = 960. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 76 × 12 = 912. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 49 × 46 = 2252. Correct or wrong? (a) wrong (b) correct

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