Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 279 · 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: 12 × 81 = 972. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 95 × 64 = 6080. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 975 + 577 = 1552. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 196 + 127 = 322. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 44 × 15 = 660. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 66 × 56 = 3696. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 46 × 17 = 779. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 962 + 129 = 1091. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 935 + 382 = 1317. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 644 + 369 = 1013. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 57 × 64 = 3651. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 12 × 33 = 396. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 626 + 120 = 746. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 678 + 979 = 1657. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 253 + 366 = 619. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 481 + 149 = 630. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 202 + 701 = 903. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 46 × 73 = 3358. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 35 × 63 = 2201. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 165 + 967 = 1132. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 71 × 76 = 5393. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 228 + 843 = 1071. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 295 + 476 = 771. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 23 × 16 = 368. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 82 × 58 = 4752. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 61 × 25 = 1520. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 987 + 325 = 1319. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 185 + 228 = 411. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 34 × 92 = 3128. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 22 × 54 = 1188. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 38 = 1061. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 36 × 61 = 2192. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 241 + 361 = 594. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 44 × 16 = 706. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 369 + 225 = 599. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 43 × 52 = 2236. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 330 + 153 = 491. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 743 + 174 = 917. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 98 × 29 = 2848. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 97 × 72 = 6984. Correct or wrong? (a) wrong (b) correct

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