Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 544 · 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: 207 + 589 = 796. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 238 + 933 = 1167. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 90 × 70 = 6300. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 995 + 249 = 1236. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 47 × 96 = 4512. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 200 + 421 = 616. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 691 + 718 = 1409. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 63 × 29 = 1833. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 90 × 83 = 7470. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 178 + 705 = 883. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 629 + 258 = 887. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 34 × 33 = 1122. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 35 × 22 = 770. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 88 = 1854. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 46 × 68 = 3128. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 669 + 546 = 1214. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 87 × 44 = 3828. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 88 × 38 = 3345. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 446 + 627 = 1080. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 34 × 12 = 408. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 24 × 93 = 2232. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 576 + 920 = 1489. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 54 × 55 = 2973. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 75 × 86 = 6451. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 561 + 735 = 1301. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 767 + 776 = 1543. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 463 + 162 = 623. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 94 × 28 = 2632. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 697 + 120 = 812. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 98 × 59 = 5780. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 742 + 808 = 1550. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 28 × 60 = 1687. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 24 × 98 = 2357. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 878 + 650 = 1523. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 265 + 803 = 1068. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 477 + 269 = 746. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 45 × 80 = 3600. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 572 + 749 = 1321. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 82 × 87 = 7132. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 28 × 66 = 1842. Correct or wrong? (a) wrong (b) correct

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