Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 695 · 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: 63 × 83 = 5231. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 368 + 430 = 798. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 82 × 32 = 2624. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 619 + 878 = 1490. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 59 × 75 = 4433. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 80 × 20 = 1602. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 52 × 85 = 4413. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 402 + 799 = 1201. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 99 × 23 = 2283. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 73 × 54 = 3942. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 612 + 831 = 1445. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 450 + 199 = 651. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 17 × 28 = 476. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 80 × 32 = 2560. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 50 × 42 = 2100. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 953 + 368 = 1321. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 442 + 506 = 948. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 376 + 964 = 1340. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 13 × 80 = 1040. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 920 + 808 = 1728. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 800 + 835 = 1635. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 745 + 319 = 1064. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 576 + 433 = 1008. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 49 × 37 = 1805. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 92 × 34 = 3128. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 53 × 13 = 690. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 15 × 69 = 1028. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 168 + 377 = 548. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 640 + 123 = 763. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 49 × 22 = 1074. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 819 + 951 = 1770. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 260 + 705 = 965. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 344 + 680 = 1032. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 200 + 244 = 444. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 28 × 97 = 2711. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 969 + 929 = 1901. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 82 × 83 = 6806. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 983 + 514 = 1497. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 66 × 75 = 4950. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 70 × 64 = 4472. Correct or wrong? (a) correct (b) wrong

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