Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 443 · 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: 85 × 30 = 2543. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 846 + 155 = 998. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 781 + 446 = 1227. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 270 + 153 = 423. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 852 + 538 = 1390. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 232 + 706 = 941. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 842 + 384 = 1226. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 567 + 639 = 1206. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 88 = 1320. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 45 = 1440. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 911 + 195 = 1106. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 855 + 745 = 1595. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 14 × 28 = 392. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 94 × 29 = 2727. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 675 + 238 = 908. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 40 × 36 = 1440. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 547 + 145 = 691. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 133 + 592 = 721. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 90 × 69 = 6210. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 17 = 1649. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 91 × 95 = 8645. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 32 × 19 = 608. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 98 × 27 = 2642. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 529 + 798 = 1327. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 62 × 96 = 5946. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 829 + 347 = 1176. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 45 = 1215. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 964 + 520 = 1490. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 267 + 496 = 763. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 964 + 677 = 1641. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 281 + 211 = 492. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 92 × 15 = 1380. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 59 × 62 = 3657. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 21 × 45 = 945. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 89 × 26 = 2313. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 62 = 4332. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 13 = 1170. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 511 + 404 = 915. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 30 × 18 = 544. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 39 × 61 = 2379. Correct or wrong? (a) correct (b) wrong

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