Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 730 · 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: 12 × 47 = 567. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 167 + 493 = 661. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 930 + 542 = 1472. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 191 + 620 = 811. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 76 × 40 = 3033. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 56 × 90 = 5042. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 53 × 33 = 1743. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 80 × 29 = 2320. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 760 + 171 = 930. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 946 + 649 = 1595. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 12 × 16 = 192. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 69 × 39 = 2691. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 724 + 443 = 1167. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 407 + 709 = 1116. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 15 × 80 = 1200. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 845 + 796 = 1641. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 224 + 121 = 345. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 686 + 815 = 1501. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 343 + 989 = 1332. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 777 + 170 = 947. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 79 = 4659. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 32 × 62 = 1989. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 91 × 41 = 3730. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 82 × 94 = 7712. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 62 × 65 = 4030. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 96 × 63 = 6048. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 363 + 860 = 1222. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 155 + 380 = 535. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 60 = 5876. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 507 + 647 = 1162. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 567 + 423 = 990. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 72 = 6549. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 163 + 132 = 291. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 19 = 589. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 944 + 947 = 1887. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 58 × 50 = 2900. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 994 + 377 = 1371. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 822 + 428 = 1245. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 98 × 15 = 1469. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 326 + 773 = 1099. Correct or wrong? (a) wrong (b) correct

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