Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 646 · 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: 800 + 137 = 940. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 519 + 290 = 809. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 20 × 73 = 1460. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 87 = 4267. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 532 + 546 = 1078. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 85 × 18 = 1530. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 16 = 1200. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 77 × 31 = 2385. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 75 × 35 = 2618. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 284 + 234 = 518. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 760 + 908 = 1668. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 718 + 847 = 1567. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 200 + 567 = 772. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 157 + 416 = 578. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 14 × 19 = 266. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 314 + 252 = 559. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 48 × 53 = 2544. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 600 + 170 = 776. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 46 × 46 = 2116. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 979 + 530 = 1501. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 91 × 50 = 4557. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 36 × 22 = 796. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 53 × 90 = 4769. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 227 + 714 = 946. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 954 + 547 = 1501. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 35 × 71 = 2485. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 51 × 63 = 3218. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 518 + 311 = 825. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 352 + 498 = 850. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 23 × 74 = 1709. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 633 + 125 = 762. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 54 × 94 = 5075. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 76 × 59 = 4484. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 881 + 520 = 1404. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 18 × 22 = 396. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 18 × 21 = 372. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 251 + 798 = 1049. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 71 × 12 = 855. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 565 + 802 = 1374. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 92 × 30 = 2760. Correct or wrong? (a) correct (b) wrong

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