Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 608 · 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: 178 + 142 = 320. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 38 × 86 = 3268. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 335 + 875 = 1210. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 83 × 12 = 1001. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 798 + 921 = 1719. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 50 × 24 = 1194. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 31 = 1302. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 21 × 23 = 483. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 43 = 854. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 71 × 87 = 6174. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 26 × 79 = 2048. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 216 + 263 = 479. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 41 × 67 = 2741. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 69 × 46 = 3174. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 186 + 431 = 617. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 52 × 44 = 2288. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 557 + 596 = 1147. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 173 + 371 = 544. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 631 + 624 = 1255. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 211 + 735 = 946. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 28 × 76 = 2128. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 35 × 44 = 1540. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 238 + 312 = 547. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 300 + 685 = 986. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 394 + 461 = 855. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 611 + 281 = 892. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 14 × 47 = 656. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 90 × 16 = 1440. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 19 × 43 = 817. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 73 × 52 = 3802. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 493 + 823 = 1316. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 958 + 824 = 1782. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 62 × 65 = 4029. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 23 × 47 = 1085. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 335 + 376 = 711. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 346 + 579 = 920. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 51 = 918. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 72 × 80 = 5765. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 274 + 182 = 456. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 463 + 178 = 641. Correct or wrong? (a) correct (b) wrong

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