Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 126 · 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: 398 + 432 = 832. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 272 + 769 = 1044. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 671 + 875 = 1553. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 527 + 962 = 1488. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 31 × 58 = 1791. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 45 = 1935. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 291 + 395 = 686. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 24 × 34 = 816. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 196 + 548 = 744. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 32 × 92 = 2944. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 688 + 217 = 905. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 970 + 794 = 1764. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 32 × 83 = 2656. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 177 + 851 = 1020. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 99 × 27 = 2679. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 20 × 53 = 1060. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 72 × 60 = 4320. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 15 × 41 = 615. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 866 + 586 = 1445. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 622 + 358 = 982. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 856 + 192 = 1047. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 362 + 639 = 1006. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 23 × 51 = 1173. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 596 + 632 = 1228. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 697 + 644 = 1341. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 536 + 854 = 1396. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 78 × 76 = 5928. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 959 + 775 = 1740. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 61 × 22 = 1342. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 76 × 64 = 4863. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 830 + 254 = 1083. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 74 × 56 = 4144. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 339 + 502 = 841. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 797 + 811 = 1608. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 57 × 49 = 2793. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 65 × 39 = 2535. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 398 + 387 = 790. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 447 + 494 = 935. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 45 × 54 = 2430. Correct or wrong? (a) correct (b) wrong

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