Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 404 · 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: 73 × 93 = 6791. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 778 + 201 = 979. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 26 × 91 = 2366. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 212 + 710 = 922. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 15 × 64 = 954. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 867 + 370 = 1237. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 43 × 15 = 645. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 705 + 438 = 1148. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 37 × 18 = 666. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 40 × 74 = 2960. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 654 + 593 = 1242. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 296 + 461 = 760. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 774 + 580 = 1354. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 698 + 662 = 1368. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 747 + 701 = 1448. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 33 = 1089. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 22 = 1163. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 41 × 52 = 2140. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 54 × 65 = 3513. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 95 × 26 = 2475. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 855 + 630 = 1485. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 21 × 17 = 357. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 32 × 32 = 1028. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 75 × 51 = 3821. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 543 + 820 = 1364. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 708 + 693 = 1401. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 50 × 74 = 3700. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 927 + 236 = 1163. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 705 + 452 = 1157. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 98 × 91 = 8918. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 133 + 492 = 625. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 94 × 65 = 6104. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 28 × 34 = 950. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 262 + 258 = 518. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 775 + 488 = 1262. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 46 × 61 = 2803. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 830 + 746 = 1571. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 87 × 79 = 6875. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 30 = 2070. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 235 + 921 = 1156. Correct or wrong? (a) wrong (b) correct

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