Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 162 · 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 × 30 = 2100. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 85 × 76 = 6458. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 561 + 806 = 1367. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 243 + 121 = 364. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 69 × 98 = 6762. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 74 × 12 = 893. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 59 = 4071. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 856 + 481 = 1337. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 202 + 965 = 1167. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 36 × 14 = 505. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 44 × 59 = 2594. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 161 + 983 = 1144. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 998 + 275 = 1273. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 272 + 406 = 680. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 49 × 30 = 1470. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 376 + 884 = 1261. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 767 + 986 = 1753. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 507 + 864 = 1371. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 41 × 52 = 2128. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 847 + 258 = 1105. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 58 × 30 = 1746. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 429 + 182 = 619. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 47 × 12 = 564. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 325 + 834 = 1159. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 995 + 785 = 1780. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 44 × 76 = 3350. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 79 = 6237. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 25 × 64 = 1600. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 269 + 521 = 797. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 776 + 200 = 976. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 65 = 4094. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 61 × 47 = 2867. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 19 × 22 = 418. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 292 + 953 = 1244. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 326 + 252 = 578. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 756 + 988 = 1744. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 80 × 62 = 4960. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 20 × 21 = 413. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 44 × 25 = 1092. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 574 + 649 = 1226. Correct or wrong? (a) wrong (b) correct

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