Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 694 · 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: 321 + 657 = 978. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 80 = 7121. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 89 × 37 = 3291. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 14 × 20 = 274. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 656 + 728 = 1384. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 52 × 38 = 1978. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 79 = 3318. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 970 + 950 = 1922. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 23 × 61 = 1404. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 29 × 91 = 2639. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 72 × 91 = 6552. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 757 + 835 = 1592. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 952 + 351 = 1303. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 448 + 304 = 753. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 16 = 1464. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 638 + 488 = 1126. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 651 + 397 = 1048. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 46 × 32 = 1471. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 279 + 958 = 1231. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 398 + 190 = 588. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 946 + 371 = 1317. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 62 × 75 = 4650. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 447 + 782 = 1236. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 626 + 786 = 1405. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 89 × 81 = 7209. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 739 + 759 = 1501. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 764 + 505 = 1263. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 176 + 900 = 1076. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 163 + 414 = 577. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 64 × 99 = 6336. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 460 + 969 = 1422. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 99 × 27 = 2673. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 23 = 2139. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 669 + 254 = 921. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 528 + 252 = 780. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 287 + 260 = 554. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 49 = 2009. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 55 × 57 = 3141. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 897 + 306 = 1201. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 52 × 47 = 2446. Correct or wrong? (a) correct (b) wrong

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