Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 783 · 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: 20 × 70 = 1401. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 300 + 845 = 1145. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 486 + 288 = 779. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 90 × 37 = 3330. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 472 + 232 = 699. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 280 + 317 = 604. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 71 × 72 = 5112. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 14 × 15 = 210. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 905 + 317 = 1222. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 70 × 34 = 2380. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 951 + 266 = 1217. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 77 × 14 = 1079. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 18 × 35 = 628. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 141 + 396 = 541. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 36 × 61 = 2195. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 971 + 717 = 1693. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 64 × 65 = 4163. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 35 = 490. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 86 × 48 = 4128. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 76 × 52 = 3953. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 715 + 644 = 1359. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 722 + 790 = 1512. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 21 × 26 = 546. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 18 = 280. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 972 + 653 = 1625. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 524 + 302 = 822. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 342 + 982 = 1324. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 90 × 19 = 1715. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 124 + 967 = 1091. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 15 × 60 = 897. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 185 + 528 = 709. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 95 × 92 = 8734. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 80 × 22 = 1760. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 681 + 370 = 1048. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 25 × 88 = 2201. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 33 × 67 = 2214. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 481 + 739 = 1220. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 303 + 607 = 913. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 874 + 152 = 1026. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 69 × 67 = 4621. Correct or wrong? (a) correct (b) wrong

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