Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 724 · 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: 499 + 334 = 833. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 317 + 298 = 615. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 592 + 244 = 831. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 26 × 14 = 357. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 12 × 68 = 816. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 470 + 669 = 1135. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 73 × 93 = 6791. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 12 × 77 = 918. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 235 + 663 = 905. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 87 × 40 = 3480. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 75 × 80 = 6004. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 646 + 525 = 1176. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 486 + 141 = 627. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 676 + 975 = 1655. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 625 + 620 = 1245. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 127 + 386 = 513. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 726 + 514 = 1240. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 628 + 626 = 1253. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 534 + 174 = 708. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 46 × 37 = 1698. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 19 = 1330. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 88 × 67 = 5892. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 918 + 417 = 1335. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 50 × 91 = 4554. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 61 × 95 = 5795. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 50 × 87 = 4346. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 75 = 1650. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 12 × 76 = 915. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 265 + 614 = 882. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 947 + 541 = 1488. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 62 × 84 = 5215. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 300 + 498 = 798. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 45 = 1344. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 24 × 37 = 881. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 259 + 163 = 422. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 44 × 95 = 4180. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 90 × 13 = 1167. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 817 + 364 = 1184. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 179 + 498 = 677. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 548 + 501 = 1047. Correct or wrong? (a) correct (b) wrong

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