Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 518 · 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: 837 + 157 = 989. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 39 × 66 = 2578. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 52 = 832. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 66 × 27 = 1785. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 16 × 98 = 1574. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 24 × 38 = 912. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 303 + 875 = 1178. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 39 × 55 = 2148. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 223 + 666 = 896. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 661 + 420 = 1078. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 59 × 28 = 1645. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 51 × 82 = 4182. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 865 + 280 = 1145. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 838 + 156 = 999. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 38 × 78 = 2964. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 689 + 361 = 1049. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 323 + 783 = 1105. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 955 + 683 = 1636. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 758 + 312 = 1070. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 271 + 316 = 587. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 98 × 16 = 1568. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 97 × 45 = 4365. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 760 + 425 = 1185. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 36 × 94 = 3384. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 812 + 765 = 1577. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 51 = 3876. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 651 + 284 = 935. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 223 + 442 = 665. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 30 × 53 = 1582. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 19 × 30 = 574. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 338 + 169 = 507. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 715 + 319 = 1032. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 59 × 81 = 4779. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 64 × 46 = 2944. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 757 + 373 = 1132. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 487 + 947 = 1441. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 811 + 391 = 1205. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 19 × 16 = 304. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 56 × 72 = 4032. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 41 × 30 = 1230. Correct or wrong? (a) wrong (b) correct

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