Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 983 · 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: 707 + 465 = 1172. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 440 + 378 = 818. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 82 × 33 = 2706. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 17 × 12 = 204. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 178 + 575 = 753. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 19 = 250. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 483 + 159 = 641. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 830 + 293 = 1121. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 755 + 568 = 1323. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 264 + 598 = 862. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 686 + 759 = 1449. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 202 + 630 = 824. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 505 + 585 = 1090. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 861 + 558 = 1419. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 55 = 4735. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 39 × 71 = 2761. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 28 × 61 = 1708. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 592 + 328 = 920. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 359 + 538 = 897. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 540 + 958 = 1494. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 20 × 24 = 480. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 36 × 20 = 722. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 84 × 24 = 2017. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 75 = 1500. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 22 × 46 = 1012. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 65 × 53 = 3439. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 46 × 89 = 4094. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 527 + 548 = 1071. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 596 + 440 = 1043. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 893 + 878 = 1771. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 21 × 61 = 1282. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 925 + 566 = 1491. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 770 + 551 = 1321. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 484 + 985 = 1469. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 57 × 99 = 5643. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 367 + 332 = 700. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 31 × 99 = 3074. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 20 × 45 = 900. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 332 + 554 = 886. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 538 + 207 = 748. Correct or wrong? (a) wrong (b) correct

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