Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 5 · 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: 87 × 21 = 1834. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 701 + 675 = 1375. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 90 × 28 = 2512. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 81 × 98 = 7938. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 932 + 546 = 1478. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 67 × 73 = 4891. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 861 + 889 = 1752. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 76 × 87 = 6619. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 18 × 54 = 972. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 305 + 633 = 938. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 91 × 71 = 6462. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 511 + 162 = 673. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 482 + 293 = 775. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 339 + 176 = 515. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 80 × 25 = 2000. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 99 × 83 = 8217. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 209 + 218 = 427. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 192 + 760 = 954. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 71 × 43 = 3053. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 87 × 63 = 5481. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 40 × 89 = 3560. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 48 × 92 = 4416. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 603 + 354 = 957. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 15 × 90 = 1350. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 155 + 383 = 538. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 209 + 203 = 415. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 25 × 79 = 1975. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 65 = 4363. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 35 = 3008. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 129 + 169 = 298. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 15 = 420. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 88 × 23 = 2021. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 27 × 24 = 644. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 431 + 302 = 733. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 800 + 944 = 1744. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 439 + 151 = 590. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 513 + 350 = 871. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 29 × 39 = 1129. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 275 + 324 = 599. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 76 = 2432. Correct or wrong? (a) correct (b) wrong

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