Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 634 · 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: 94 × 55 = 5174. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 29 × 75 = 2170. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 449 + 632 = 1088. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 217 + 588 = 805. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 136 + 206 = 334. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 761 + 733 = 1494. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 20 × 62 = 1240. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 20 × 34 = 680. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 410 + 582 = 992. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 912 + 730 = 1647. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 59 × 28 = 1652. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 80 × 65 = 5200. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 269 + 237 = 506. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 33 × 32 = 1057. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 60 × 75 = 4500. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 138 + 246 = 384. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 344 + 259 = 601. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 74 × 56 = 4146. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 370 + 558 = 934. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 49 × 27 = 1330. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 69 × 40 = 2760. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 710 + 725 = 1436. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 40 × 53 = 2113. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 255 + 817 = 1072. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 41 × 42 = 1722. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 843 + 876 = 1719. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 13 = 1131. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 363 + 548 = 913. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 91 × 51 = 4641. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 44 × 65 = 2856. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 31 × 79 = 2444. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 535 + 405 = 940. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 910 + 397 = 1311. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 244 + 907 = 1159. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 18 × 28 = 504. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 65 × 85 = 5525. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 923 + 537 = 1460. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 220 + 422 = 642. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 127 + 978 = 1103. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 13 × 52 = 673. Correct or wrong? (a) correct (b) wrong

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