Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 606 · 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: 139 + 516 = 655. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 298 + 932 = 1230. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 192 + 626 = 818. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 50 × 39 = 1952. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 622 + 163 = 784. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 575 + 846 = 1428. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 17 = 1343. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 98 × 85 = 8330. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 344 + 337 = 679. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 253 + 764 = 1009. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 608 + 980 = 1588. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 50 × 33 = 1650. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 73 × 71 = 5183. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 707 + 419 = 1132. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 777 + 143 = 922. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 17 × 80 = 1361. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 85 × 73 = 6209. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 328 + 485 = 805. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 351 + 324 = 676. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 21 × 55 = 1155. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 41 × 98 = 4018. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 87 × 46 = 4002. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 26 × 19 = 494. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 42 × 47 = 1975. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 53 × 75 = 3983. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 487 + 309 = 802. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 257 + 246 = 503. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 176 + 998 = 1178. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 92 × 12 = 1104. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 86 × 21 = 1806. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 491 + 496 = 987. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 613 + 346 = 959. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 682 + 164 = 846. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 330 + 331 = 666. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 67 × 65 = 4363. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 950 + 679 = 1635. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 367 + 913 = 1282. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 32 × 67 = 2144. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 282 + 456 = 736. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 892 + 461 = 1353. Correct or wrong? (a) wrong (b) correct

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