Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 599 · 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: 52 × 64 = 3328. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 947 + 327 = 1274. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 761 + 597 = 1358. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 42 × 94 = 3948. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 699 + 322 = 1018. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 36 × 47 = 1692. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 84 = 6048. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 20 × 91 = 1816. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 975 + 982 = 1957. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 95 × 54 = 5134. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 40 × 29 = 1168. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 781 + 423 = 1212. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 717 + 925 = 1639. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 31 × 39 = 1211. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 42 × 33 = 1386. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 932 + 901 = 1833. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 88 × 65 = 5716. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 51 × 21 = 1064. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 354 + 523 = 877. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 970 + 392 = 1362. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 24 × 36 = 864. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 67 × 83 = 5561. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 40 × 41 = 1636. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 62 = 5091. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 66 × 95 = 6271. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 136 + 320 = 457. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 57 × 83 = 4731. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 965 + 656 = 1625. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 92 × 31 = 2858. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 23 × 33 = 759. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 39 × 81 = 3159. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 923 + 886 = 1809. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 413 + 366 = 783. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 182 + 911 = 1095. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 148 + 770 = 918. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 901 + 232 = 1131. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 792 + 150 = 942. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 229 + 180 = 409. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 306 + 662 = 968. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 240 + 239 = 479. Correct or wrong? (a) wrong (b) correct

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