Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 727 · 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: 47 × 33 = 1551. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 21 × 41 = 854. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 972 + 590 = 1562. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 56 × 89 = 4983. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 51 × 61 = 3111. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 15 × 45 = 677. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 608 + 850 = 1458. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 892 + 491 = 1387. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 76 × 61 = 4643. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 468 + 495 = 956. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 20 × 34 = 681. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 69 × 83 = 5719. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 61 × 75 = 4575. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 327 + 453 = 780. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 586 + 616 = 1206. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 53 × 21 = 1109. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 32 × 26 = 830. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 34 = 2723. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 52 × 82 = 4270. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 80 × 77 = 6166. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 478 + 703 = 1181. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 81 × 64 = 5179. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 42 × 26 = 1092. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 363 + 288 = 651. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 704 + 861 = 1569. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 89 × 34 = 3026. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 23 × 72 = 1654. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 604 + 186 = 790. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 13 × 22 = 291. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 819 + 742 = 1553. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 768 + 147 = 921. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 590 + 795 = 1385. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 19 × 33 = 634. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 413 + 674 = 1094. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 92 × 65 = 5979. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 749 + 957 = 1713. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 999 + 834 = 1833. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 942 + 712 = 1654. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 159 + 864 = 1025. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 495 + 743 = 1238. Correct or wrong? (a) wrong (b) correct

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