Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 542 · 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: 968 + 688 = 1656. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 740 + 832 = 1572. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 78 × 57 = 4448. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 292 + 725 = 1017. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 792 + 217 = 1009. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 614 + 130 = 744. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 260 + 953 = 1213. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 64 × 25 = 1593. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 413 + 201 = 609. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 133 + 166 = 299. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 528 + 674 = 1202. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 306 + 960 = 1266. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 153 + 340 = 490. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 49 × 73 = 3582. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 66 = 6072. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 265 + 979 = 1238. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 655 + 254 = 909. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 95 × 19 = 1808. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 207 + 230 = 431. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 902 + 303 = 1205. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 634 + 193 = 820. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 85 × 62 = 5270. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 47 × 63 = 2964. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 470 + 170 = 639. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 573 + 618 = 1191. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 465 + 431 = 896. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 64 = 2816. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 967 + 529 = 1499. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 87 × 40 = 3480. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 15 × 66 = 990. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 40 × 35 = 1400. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 90 × 95 = 8547. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 333 + 207 = 540. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 341 + 989 = 1325. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 63 = 943. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 311 + 893 = 1211. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 164 + 934 = 1103. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 380 + 688 = 1068. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 236 + 387 = 629. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 499 + 892 = 1391. Correct or wrong? (a) correct (b) wrong

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