Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 600 · 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: 60 × 22 = 1324. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 43 × 18 = 774. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 780 + 133 = 909. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 720 + 623 = 1348. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 24 × 71 = 1704. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 96 = 2880. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 328 + 904 = 1232. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 65 × 99 = 6441. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 60 × 27 = 1620. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 989 + 464 = 1453. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 653 + 920 = 1573. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 59 × 19 = 1121. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 69 × 23 = 1587. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 245 + 524 = 761. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 30 × 24 = 728. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 740 + 142 = 888. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 146 + 745 = 891. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 848 + 145 = 993. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 364 + 487 = 851. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 298 + 669 = 972. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 99 × 77 = 7623. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 147 + 916 = 1066. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 23 × 93 = 2139. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 13 × 30 = 390. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 566 + 169 = 735. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 824 + 187 = 1011. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 62 × 29 = 1806. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 263 + 536 = 799. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 64 = 6275. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 159 + 641 = 800. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 34 × 75 = 2545. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 88 × 66 = 5808. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 43 × 57 = 2451. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 221 + 126 = 344. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 82 = 1230. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 72 = 5040. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 951 + 448 = 1401. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 69 × 35 = 2415. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 75 = 5325. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 76 × 82 = 6235. Correct or wrong? (a) correct (b) wrong

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