Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 862 · 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: 22 × 53 = 1170. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 81 × 43 = 3475. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 699 + 447 = 1146. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 50 × 85 = 4253. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 523 + 900 = 1423. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 55 × 24 = 1320. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 73 × 31 = 2271. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 857 + 446 = 1308. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 48 × 59 = 2832. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 68 × 76 = 5174. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 17 × 54 = 911. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 41 × 92 = 3772. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 75 × 51 = 3825. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 565 + 311 = 879. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 25 × 18 = 447. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 35 × 85 = 2975. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 75 × 96 = 7200. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 46 × 28 = 1288. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 74 × 60 = 4440. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 62 × 24 = 1488. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 66 × 21 = 1386. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 94 × 24 = 2263. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 454 + 654 = 1105. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 540 + 357 = 899. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 74 × 89 = 6581. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 19 × 43 = 819. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 39 × 97 = 3788. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 39 × 17 = 660. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 146 + 197 = 341. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 88 × 41 = 3608. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 685 + 343 = 1028. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 75 = 5692. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 149 + 686 = 842. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 74 × 66 = 4884. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 47 × 21 = 995. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 86 × 79 = 6794. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 45 × 85 = 3825. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 51 × 40 = 2042. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 43 = 559. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 75 × 77 = 5775. Correct or wrong? (a) correct (b) wrong

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