Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 76 · 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: 35 × 13 = 455. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 123 + 578 = 700. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 65 × 31 = 2015. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 72 = 1800. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 27 × 53 = 1431. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 173 + 364 = 537. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 93 × 84 = 7812. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 89 × 30 = 2668. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 46 × 23 = 1064. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 19 × 85 = 1615. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 307 + 778 = 1085. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 43 × 61 = 2623. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 42 × 50 = 2100. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 361 + 132 = 488. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 982 + 567 = 1553. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 55 × 68 = 3740. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 32 × 84 = 2688. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 353 + 127 = 480. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 19 × 40 = 767. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 99 × 91 = 9009. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 693 + 509 = 1202. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 50 × 53 = 2645. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 40 × 86 = 3446. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 42 × 97 = 4081. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 24 × 22 = 528. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 367 + 575 = 942. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 41 × 45 = 1840. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 85 × 56 = 4760. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 87 = 3219. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 21 × 54 = 1127. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 48 × 93 = 4459. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 936 + 340 = 1276. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 53 = 1582. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 99 × 25 = 2475. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 816 + 689 = 1505. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 85 × 32 = 2720. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 288 + 362 = 650. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 89 × 37 = 3293. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 42 × 72 = 3024. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 66 = 1914. Correct or wrong? (a) wrong (b) correct

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