Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 805 · 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: 430 + 198 = 628. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 613 + 608 = 1221. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 406 + 681 = 1087. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 34 × 48 = 1632. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 771 + 426 = 1197. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 84 × 48 = 4032. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 757 + 903 = 1664. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 98 × 33 = 3232. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 38 × 87 = 3312. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 343 + 934 = 1277. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 227 + 730 = 953. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 26 × 52 = 1352. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 43 × 17 = 731. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 237 + 671 = 900. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 963 + 713 = 1671. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 43 × 75 = 3231. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 964 + 975 = 1947. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 69 = 3105. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 892 + 762 = 1654. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 50 × 99 = 4950. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 139 + 921 = 1060. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 798 + 942 = 1740. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 490 + 630 = 1120. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 63 × 28 = 1764. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 594 + 638 = 1232. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 259 + 256 = 515. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 357 + 361 = 718. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 808 + 402 = 1210. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 886 + 487 = 1371. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 316 + 535 = 845. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 524 + 827 = 1351. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 35 × 57 = 1991. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 562 + 978 = 1540. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 76 × 57 = 4330. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 539 + 375 = 908. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 85 × 12 = 1016. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 74 × 49 = 3626. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 74 × 56 = 4144. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 60 = 4140. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 258 + 162 = 426. Correct or wrong? (a) wrong (b) correct

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