Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 397 · 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: 87 × 34 = 2958. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 538 + 564 = 1095. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 59 = 1884. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 34 = 1870. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 81 × 75 = 6075. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 89 × 45 = 4005. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 321 + 644 = 965. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 46 × 64 = 2941. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 333 + 365 = 705. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 24 × 88 = 2105. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 58 × 56 = 3250. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 22 × 91 = 2000. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 949 + 633 = 1590. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 61 × 57 = 3472. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 96 × 89 = 8544. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 288 + 543 = 830. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 430 + 492 = 922. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 404 + 572 = 976. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 13 × 22 = 286. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 291 + 843 = 1136. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 70 = 1476. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 88 × 30 = 2640. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 281 + 414 = 692. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 924 + 175 = 1103. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 388 + 729 = 1117. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 57 × 35 = 1995. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 88 × 52 = 4576. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 332 + 978 = 1310. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 829 + 140 = 961. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 63 × 55 = 3465. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 16 × 31 = 496. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 88 × 57 = 5012. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 835 + 783 = 1618. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 333 + 231 = 570. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 498 + 862 = 1361. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 86 × 50 = 4307. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 785 + 531 = 1316. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 71 × 26 = 1849. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 322 + 937 = 1259. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 16 × 66 = 1056. Correct or wrong? (a) correct (b) wrong

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