Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 895 · 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: 20 × 42 = 843. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 405 + 425 = 830. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 91 = 2555. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 94 = 6398. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 79 × 92 = 7275. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 308 + 703 = 1011. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 57 × 95 = 5413. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 671 + 220 = 899. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 460 + 587 = 1044. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 75 × 86 = 6450. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 41 = 1353. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 26 × 74 = 1930. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 53 × 15 = 795. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 26 × 24 = 624. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 88 × 91 = 8008. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 132 + 326 = 458. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 64 = 2944. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 16 × 27 = 432. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 758 + 529 = 1287. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 87 × 61 = 5307. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 48 × 62 = 2976. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 33 × 79 = 2607. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 380 + 718 = 1100. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 87 × 98 = 8526. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 59 × 93 = 5487. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 703 + 639 = 1342. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 323 + 366 = 689. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 386 + 142 = 528. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 632 + 982 = 1607. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 92 × 68 = 6256. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 33 × 53 = 1757. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 240 + 925 = 1165. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 290 + 700 = 983. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 48 × 81 = 3888. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 627 + 694 = 1329. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 61 = 5612. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 151 + 265 = 413. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 35 = 455. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 992 + 917 = 1909. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 55 × 29 = 1595. Correct or wrong? (a) correct (b) wrong

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