Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 537 · 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: 33 × 63 = 2079. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 764 + 505 = 1269. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 54 × 70 = 3780. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 49 × 15 = 732. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 54 × 53 = 2862. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 62 × 26 = 1618. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 885 + 342 = 1219. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 267 + 441 = 705. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 88 × 61 = 5369. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 489 + 974 = 1471. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 38 × 35 = 1328. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 596 + 351 = 952. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 184 + 296 = 480. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 16 × 39 = 624. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 784 + 951 = 1737. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 865 + 166 = 1031. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 15 × 27 = 405. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 68 = 1700. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 90 = 5310. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 776 + 308 = 1082. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 19 × 46 = 874. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 302 + 224 = 526. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 366 + 157 = 515. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 495 + 319 = 814. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 508 + 900 = 1416. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 480 + 250 = 734. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 36 × 68 = 2448. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 12 × 51 = 607. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 36 × 57 = 2057. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 766 + 549 = 1315. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 847 + 745 = 1584. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 227 + 206 = 433. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 29 = 690. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 63 × 82 = 5165. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 475 + 340 = 818. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 86 × 99 = 8514. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 41 = 2742. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 969 + 147 = 1116. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 630 + 993 = 1623. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 49 × 57 = 2793. Correct or wrong? (a) wrong (b) correct

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