Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 157 · 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: 172 + 853 = 1017. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 53 × 12 = 644. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 92 × 27 = 2484. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 70 = 2870. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 45 × 63 = 2829. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 99 × 67 = 6633. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 36 × 82 = 2952. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 37 × 52 = 1924. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 94 × 97 = 9118. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 649 + 147 = 798. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 90 × 34 = 3060. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 98 × 55 = 5393. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 81 × 44 = 3568. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 24 × 19 = 448. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 751 + 556 = 1307. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 133 + 975 = 1108. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 317 + 669 = 990. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 89 × 14 = 1242. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 303 + 353 = 660. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 159 + 485 = 639. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 307 + 265 = 572. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 40 × 94 = 3760. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 377 + 977 = 1354. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 15 × 99 = 1485. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 67 × 76 = 5092. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 632 + 878 = 1512. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 142 + 181 = 320. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 941 + 262 = 1207. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 199 + 631 = 827. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 44 × 81 = 3560. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 36 × 74 = 2664. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 925 + 230 = 1156. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 557 + 489 = 1046. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 588 + 973 = 1561. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 467 + 204 = 677. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 492 + 580 = 1072. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 332 + 333 = 663. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 736 + 565 = 1301. Correct or wrong? (a) correct (b) wrong

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