Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 773 · 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: 93 × 63 = 5859. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 531 + 202 = 733. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 801 + 592 = 1393. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 388 + 380 = 768. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 98 × 35 = 3430. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 91 × 24 = 2184. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 19 × 44 = 836. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 581 + 338 = 921. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 57 × 93 = 5304. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 610 + 763 = 1373. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 732 + 341 = 1080. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 417 + 287 = 701. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 72 × 23 = 1656. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 36 = 1836. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 978 + 599 = 1577. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 338 + 720 = 1062. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 96 × 23 = 2210. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 551 + 911 = 1462. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 450 + 588 = 1038. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 57 × 49 = 2787. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 808 + 166 = 974. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 68 × 98 = 6664. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 18 × 57 = 1022. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 66 × 75 = 4944. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 59 × 50 = 2943. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 89 × 26 = 2311. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 24 = 940. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 89 × 13 = 1157. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 67 × 20 = 1340. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 61 × 66 = 4027. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 84 = 1680. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 810 + 171 = 973. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 60 × 74 = 4440. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 88 × 84 = 7394. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 283 + 314 = 598. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 29 × 60 = 1740. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 92 × 64 = 5888. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 252 + 379 = 631. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 466 + 462 = 928. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 245 + 856 = 1101. Correct or wrong? (a) wrong (b) correct

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