Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 817 · 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: 708 + 807 = 1517. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 24 × 42 = 1005. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 501 + 518 = 1014. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 470 + 730 = 1196. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 678 + 953 = 1631. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 67 × 48 = 3216. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 55 = 3080. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 92 × 16 = 1472. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 578 + 900 = 1484. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 75 = 4125. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 23 × 88 = 2032. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 12 × 12 = 144. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 18 × 36 = 647. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 832 + 900 = 1732. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 47 × 72 = 3382. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 234 + 368 = 602. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 417 + 840 = 1257. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 55 × 64 = 3520. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 20 × 35 = 698. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 13 × 62 = 800. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 567 + 129 = 696. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 686 + 821 = 1507. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 439 + 774 = 1213. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 286 + 356 = 634. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 891 + 581 = 1472. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 760 + 294 = 1054. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 47 × 66 = 3110. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 51 × 99 = 5052. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 26 × 67 = 1742. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 739 + 451 = 1196. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 441 + 887 = 1335. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 27 × 33 = 885. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 536 + 222 = 758. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 675 + 931 = 1606. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 242 + 823 = 1070. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 27 × 47 = 1269. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 41 × 75 = 3075. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 99 × 55 = 5445. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 13 × 49 = 637. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 40 × 44 = 1760. Correct or wrong? (a) wrong (b) correct

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