Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 703 · 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: 860 + 596 = 1458. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 38 × 74 = 2812. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 383 + 388 = 771. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 559 + 846 = 1405. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 731 + 262 = 993. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 901 + 676 = 1581. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 73 × 25 = 1825. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 37 × 29 = 1072. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 39 = 1008. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 247 + 400 = 647. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 93 × 17 = 1586. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 249 + 809 = 1060. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 346 + 944 = 1290. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 28 × 72 = 2022. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 65 × 33 = 2145. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 36 × 55 = 1980. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 524 + 220 = 744. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 744 + 504 = 1255. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 13 = 768. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 829 + 327 = 1151. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 794 + 149 = 943. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 42 × 29 = 1221. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 358 + 339 = 697. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 18 × 50 = 900. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 290 + 927 = 1217. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 52 = 1404. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 352 + 605 = 953. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 98 × 85 = 8330. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 31 × 51 = 1581. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 85 = 1452. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 536 + 871 = 1407. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 65 × 34 = 2210. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 402 + 999 = 1399. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 88 × 62 = 5454. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 483 + 565 = 1048. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 62 = 3407. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 72 × 14 = 1014. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 993 + 905 = 1893. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 58 × 39 = 2262. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 453 + 123 = 576. Correct or wrong? (a) wrong (b) correct

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