Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 752 · 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: 70 × 77 = 5390. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 83 × 40 = 3320. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 780 + 374 = 1151. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 508 + 227 = 735. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 72 × 64 = 4612. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 33 × 51 = 1683. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 926 + 448 = 1370. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 31 × 23 = 713. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 607 + 712 = 1319. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 39 = 2027. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 47 × 45 = 2107. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 248 + 702 = 950. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 92 = 5062. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 693 + 838 = 1531. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 65 × 72 = 4680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 45 × 49 = 2205. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 34 × 77 = 2618. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 586 + 946 = 1535. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 210 + 995 = 1205. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 958 + 888 = 1846. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 824 + 854 = 1678. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 97 × 65 = 6305. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 391 + 466 = 855. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 18 × 12 = 216. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 258 + 451 = 711. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 772 + 535 = 1309. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 851 + 965 = 1813. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 855 + 682 = 1537. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 90 × 26 = 2344. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 19 × 36 = 686. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 77 × 53 = 4076. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 917 + 843 = 1765. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 292 + 639 = 938. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 664 + 993 = 1659. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 426 + 215 = 636. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 62 × 38 = 2356. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 282 + 954 = 1244. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 85 × 17 = 1452. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 228 + 189 = 411. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 69 × 54 = 3732. Correct or wrong? (a) correct (b) wrong

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