Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 88 · 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: 966 + 457 = 1416. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 64 × 99 = 6336. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 171 + 315 = 493. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 89 × 28 = 2492. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 206 + 263 = 469. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 644 + 857 = 1501. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 53 × 42 = 2226. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 910 + 494 = 1404. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 95 × 30 = 2850. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 98 × 32 = 3136. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 97 × 21 = 2037. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 920 + 894 = 1814. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 31 = 894. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 50 × 28 = 1399. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 364 + 230 = 594. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 15 = 1305. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 554 + 964 = 1517. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 68 × 98 = 6664. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 25 × 16 = 405. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 257 + 555 = 812. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 156 + 981 = 1143. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 391 + 649 = 1040. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 66 = 917. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 328 + 563 = 891. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 341 + 557 = 898. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 26 = 1968. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 12 = 822. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 73 × 42 = 3066. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 838 + 175 = 1013. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 56 × 80 = 4480. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 17 × 50 = 850. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 36 × 28 = 1009. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 45 = 3145. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 421 + 844 = 1259. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 968 + 620 = 1588. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 21 × 39 = 819. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 21 × 57 = 1197. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 13 = 161. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 944 + 842 = 1786. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 59 × 14 = 826. Correct or wrong? (a) correct (b) wrong

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