Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 95 · 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: 459 + 383 = 842. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 342 + 401 = 750. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 20 × 32 = 642. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 86 × 53 = 4558. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 597 + 727 = 1324. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 932 + 141 = 1072. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 257 + 805 = 1065. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 31 × 67 = 2079. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 360 + 241 = 594. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 857 + 138 = 997. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 576 + 829 = 1405. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 57 × 21 = 1197. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 35 = 805. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 24 × 12 = 288. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 816 + 975 = 1791. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 80 = 2642. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 79 = 5840. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 34 × 63 = 2142. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 45 × 91 = 4088. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 66 × 35 = 2303. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 13 × 56 = 728. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 380 + 592 = 973. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 12 = 155. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 64 × 23 = 1473. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 984 + 718 = 1710. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 425 + 858 = 1275. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 173 + 367 = 535. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 16 × 91 = 1462. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 608 + 135 = 742. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 822 + 921 = 1745. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 295 + 312 = 610. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 59 × 85 = 5015. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 180 + 380 = 560. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 132 + 546 = 678. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 36 × 74 = 2664. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 280 + 648 = 928. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 432 + 123 = 555. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 51 × 73 = 3725. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 39 × 30 = 1170. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 642 + 879 = 1521. Correct or wrong? (a) wrong (b) correct

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