Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 991 · 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: 848 + 206 = 1056. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 811 + 585 = 1396. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 305 + 257 = 562. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 22 × 50 = 1100. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 73 × 20 = 1460. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 20 = 1720. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 80 × 44 = 3518. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 90 × 89 = 8009. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 22 × 76 = 1667. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 16 = 832. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 56 × 68 = 3808. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 957 + 522 = 1479. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 288 + 843 = 1127. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 44 = 792. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 699 + 884 = 1583. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 906 + 832 = 1738. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 81 × 12 = 966. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 493 + 765 = 1263. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 295 + 728 = 1023. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 41 × 87 = 3567. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 22 × 46 = 1011. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 67 × 64 = 4289. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 24 × 96 = 2304. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 800 + 962 = 1766. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 34 × 87 = 2956. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 842 + 496 = 1336. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 29 = 698. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 289 + 201 = 493. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 23 × 93 = 2134. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 188 + 290 = 478. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 687 + 589 = 1272. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 33 × 40 = 1320. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 35 × 38 = 1331. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 469 + 444 = 913. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 29 × 66 = 1914. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 61 = 4629. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 250 + 537 = 787. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 643 + 410 = 1053. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 84 × 93 = 7820. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 97 × 88 = 8530. Correct or wrong? (a) wrong (b) correct

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