Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 453 · 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: 700 + 639 = 1339. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 29 × 47 = 1359. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 63 × 27 = 1696. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 24 × 80 = 1920. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 666 + 917 = 1583. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 48 × 41 = 1968. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 347 + 983 = 1330. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 52 × 30 = 1560. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 527 + 241 = 770. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 30 × 55 = 1650. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 51 = 4328. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 81 × 34 = 2746. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 572 + 354 = 924. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 12 = 217. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 80 × 90 = 7200. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 26 = 710. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 23 × 51 = 1180. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 74 × 73 = 5402. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 28 × 38 = 1060. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 695 + 415 = 1112. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 13 × 89 = 1157. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 573 + 485 = 1058. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 465 + 904 = 1369. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 457 + 912 = 1367. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 57 × 75 = 4275. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 996 + 363 = 1359. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 66 × 21 = 1388. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 60 × 73 = 4380. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 275 + 633 = 912. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 375 + 360 = 735. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 942 + 177 = 1119. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 20 = 1405. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 60 × 58 = 3480. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 760 + 809 = 1569. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 627 + 595 = 1219. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 176 + 767 = 944. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 84 × 35 = 2933. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 424 + 410 = 826. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 12 × 70 = 840. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 31 × 18 = 558. Correct or wrong? (a) wrong (b) correct

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