Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 722 · 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: 700 + 364 = 1061. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 234 + 648 = 882. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 883 + 550 = 1428. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 179 + 403 = 580. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 92 × 29 = 2670. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 93 × 20 = 1860. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 395 + 779 = 1174. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 48 = 1586. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 710 + 530 = 1240. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 153 + 591 = 750. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 43 × 94 = 4045. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 174 + 139 = 313. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 639 + 486 = 1125. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 211 + 353 = 562. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 351 + 988 = 1334. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 19 × 19 = 361. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 556 + 668 = 1223. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 233 + 362 = 595. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 59 × 53 = 3127. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 439 + 185 = 624. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 250 + 365 = 613. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 34 × 23 = 782. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 72 × 52 = 3740. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 957 + 221 = 1174. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 34 × 84 = 2860. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 96 × 16 = 1536. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 508 + 288 = 794. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 970 + 339 = 1313. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 71 × 29 = 2056. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 52 × 32 = 1663. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 29 × 31 = 899. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 157 + 316 = 473. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 85 × 29 = 2465. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 328 + 597 = 928. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 24 = 890. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 31 × 42 = 1302. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 241 + 353 = 598. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 398 + 292 = 690. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 838 + 300 = 1138. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 17 = 1224. Correct or wrong? (a) wrong (b) correct

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