Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 956 · 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: 43 × 39 = 1681. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 44 × 77 = 3380. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 517 + 441 = 958. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 695 + 943 = 1637. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 302 + 231 = 528. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 714 + 465 = 1179. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 350 + 171 = 521. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 751 + 152 = 907. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 514 + 455 = 971. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 565 + 563 = 1128. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 76 × 26 = 1976. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 27 × 18 = 486. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 64 × 15 = 958. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 450 + 521 = 978. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 640 + 373 = 1013. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 378 + 598 = 969. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 984 + 147 = 1131. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 13 × 79 = 1026. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 38 × 82 = 3116. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 516 + 125 = 636. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 33 × 45 = 1485. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 54 × 49 = 2646. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 67 × 80 = 5366. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 68 × 16 = 1088. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 82 × 93 = 7626. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 336 + 439 = 767. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 464 + 209 = 673. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 97 × 61 = 5917. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 50 × 31 = 1550. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 34 × 86 = 2925. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 78 × 91 = 7098. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 13 × 73 = 949. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 82 × 62 = 5083. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 948 + 852 = 1800. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 167 + 177 = 338. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 30 × 32 = 966. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 678 + 388 = 1059. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 15 × 28 = 420. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 469 + 551 = 1020. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 308 + 755 = 1067. Correct or wrong? (a) correct (b) wrong

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