Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 626 · 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: 37 × 32 = 1178. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 936 + 545 = 1481. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 696 + 870 = 1566. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 853 + 870 = 1730. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 37 × 59 = 2184. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 75 × 57 = 4275. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 19 = 798. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 998 + 471 = 1469. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 77 × 71 = 5467. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 579 + 309 = 896. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 935 + 310 = 1249. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 447 + 400 = 847. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 217 + 817 = 1032. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 879 + 463 = 1342. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 811 + 188 = 1003. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 40 × 45 = 1800. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 603 + 668 = 1267. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 166 + 420 = 593. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 614 + 340 = 955. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 56 × 60 = 3360. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 58 = 5104. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 60 × 14 = 841. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 60 = 4860. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 83 × 24 = 1986. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 857 + 871 = 1731. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 52 × 55 = 2860. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 572 + 689 = 1267. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 29 × 23 = 667. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 452 + 411 = 863. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 770 + 193 = 963. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 63 × 79 = 4977. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 16 × 28 = 448. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 915 + 190 = 1105. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 81 × 55 = 4455. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 900 + 831 = 1731. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 195 + 674 = 875. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 125 + 282 = 407. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 429 + 138 = 570. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 64 × 90 = 5762. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 775 + 857 = 1624. Correct or wrong? (a) correct (b) wrong

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