Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 530 · 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: 842 + 711 = 1551. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 878 + 295 = 1173. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 480 + 672 = 1147. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 831 + 830 = 1661. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 14 × 97 = 1365. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 12 × 79 = 949. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 62 × 72 = 4464. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 12 × 12 = 152. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 29 × 73 = 2112. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 53 × 22 = 1166. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 84 × 21 = 1764. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 31 = 3069. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 36 × 21 = 756. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 19 × 65 = 1239. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 77 × 33 = 2541. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 89 × 46 = 4094. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 955 + 535 = 1489. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 99 × 22 = 2181. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 99 × 81 = 8019. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 164 + 981 = 1145. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 224 + 314 = 543. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 990 + 874 = 1864. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 78 × 78 = 6084. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 835 + 210 = 1045. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 13 × 90 = 1170. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 640 + 436 = 1076. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 232 + 957 = 1190. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 773 + 652 = 1425. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 92 = 8740. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 75 = 1282. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 21 × 32 = 672. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 607 + 130 = 731. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 16 × 77 = 1232. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 981 + 468 = 1449. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 76 × 20 = 1512. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 225 + 560 = 791. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 610 + 190 = 800. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 23 = 590. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 81 × 53 = 4293. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 82 × 71 = 5830. Correct or wrong? (a) wrong (b) correct

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