Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 127 · 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: 124 + 524 = 648. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 69 × 49 = 3383. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 981 + 384 = 1365. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 423 + 223 = 649. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 68 × 16 = 1088. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 49 = 4312. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 327 + 266 = 593. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 14 × 69 = 965. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 415 + 700 = 1115. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 186 + 231 = 412. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 90 × 20 = 1800. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 994 + 474 = 1468. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 32 × 89 = 2848. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 92 × 46 = 4232. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 184 + 920 = 1105. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 752 + 195 = 947. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 324 + 758 = 1088. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 758 + 248 = 1006. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 26 × 83 = 2158. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 57 × 42 = 2393. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 27 × 22 = 594. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 87 × 48 = 4176. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 838 + 260 = 1093. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 563 + 477 = 1043. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 847 + 544 = 1396. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 418 + 883 = 1301. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 94 × 34 = 3196. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 352 + 984 = 1331. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 38 × 67 = 2545. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 181 + 927 = 1108. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 12 × 46 = 552. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 670 + 594 = 1269. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 35 × 26 = 910. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 299 + 185 = 484. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 34 × 30 = 1013. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 16 = 192. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 599 + 262 = 863. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 23 × 38 = 874. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 477 + 689 = 1162. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 14 = 448. Correct or wrong? (a) correct (b) wrong

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