Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 322 · 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: 500 + 152 = 652. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 65 = 1040. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 69 × 82 = 5658. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 32 × 86 = 2752. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 327 + 481 = 811. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 792 + 523 = 1315. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 18 = 540. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 423 + 652 = 1079. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 12 = 288. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 709 + 175 = 882. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 34 × 26 = 884. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 34 × 84 = 2856. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 900 + 157 = 1055. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 61 × 66 = 4018. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 95 × 46 = 4365. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 718 + 231 = 949. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 557 + 722 = 1279. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 69 × 40 = 2760. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 492 + 575 = 1067. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 38 × 25 = 950. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 477 + 533 = 1003. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 151 + 740 = 887. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 430 + 674 = 1104. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 241 + 623 = 872. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 657 + 727 = 1384. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 60 × 58 = 3484. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 16 × 84 = 1351. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 88 = 1755. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 354 + 139 = 496. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 541 + 610 = 1152. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 430 + 463 = 896. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 59 × 49 = 2897. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 92 × 39 = 3588. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 43 = 1596. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 429 + 497 = 926. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 32 × 18 = 579. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 251 + 686 = 942. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 955 + 611 = 1566. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 49 × 26 = 1274. Correct or wrong? (a) correct (b) wrong

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