Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 70 · 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: 646 + 326 = 972. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 16 = 1568. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 34 = 1088. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 44 × 76 = 3345. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 373 + 536 = 909. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 900 + 360 = 1260. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 996 + 639 = 1635. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 162 + 550 = 712. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 86 × 29 = 2486. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 89 × 83 = 7387. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 178 + 135 = 314. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 351 + 874 = 1225. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 184 + 250 = 431. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 81 × 90 = 7290. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 551 + 308 = 852. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 89 = 2848. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 993 + 165 = 1159. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 27 × 95 = 2565. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 314 + 990 = 1304. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 38 × 16 = 608. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 826 + 371 = 1198. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 94 × 18 = 1691. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 316 + 675 = 991. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 728 + 932 = 1660. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 35 × 29 = 1015. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 12 × 59 = 715. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 479 + 825 = 1304. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 955 + 287 = 1246. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 60 × 46 = 2765. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 36 = 547. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 16 × 40 = 636. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 13 × 89 = 1157. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 384 + 274 = 658. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 42 × 95 = 3984. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 84 × 64 = 5380. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 278 + 170 = 448. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 290 + 678 = 968. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 74 = 5253. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 86 × 83 = 7138. Correct or wrong? (a) correct (b) wrong

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