Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 806 · 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: 78 × 25 = 1950. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 816 + 588 = 1404. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 23 × 75 = 1725. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 154 + 436 = 590. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 54 × 43 = 2322. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 84 = 7392. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 771 + 299 = 1070. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 55 × 92 = 5060. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 93 × 27 = 2512. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 829 + 688 = 1517. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 941 + 523 = 1464. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 72 × 68 = 4904. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 32 × 23 = 736. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 60 × 99 = 5939. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 85 × 25 = 2125. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 738 + 582 = 1320. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 547 + 593 = 1144. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 166 + 395 = 561. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 884 + 231 = 1117. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 489 + 572 = 1061. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 121 + 125 = 246. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 270 + 294 = 565. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 52 × 22 = 1136. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 214 + 872 = 1086. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 999 + 839 = 1838. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 98 = 7448. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 781 + 939 = 1723. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 47 × 83 = 3906. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 473 + 222 = 696. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 635 + 401 = 1036. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 44 × 28 = 1235. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 880 + 921 = 1801. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 20 = 1160. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 605 + 628 = 1232. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 96 × 95 = 9124. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 27 × 35 = 948. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 211 + 338 = 552. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 90 = 1266. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 41 × 23 = 943. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 722 + 642 = 1359. Correct or wrong? (a) correct (b) wrong

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