Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 494 · 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: 25 × 33 = 825. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 759 + 371 = 1131. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 224 + 155 = 372. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 628 + 565 = 1193. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 856 + 212 = 1068. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 35 × 93 = 3257. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 96 × 44 = 4216. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 12 × 75 = 907. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 171 + 368 = 536. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 46 × 30 = 1380. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 74 = 3478. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 947 + 552 = 1499. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 69 × 68 = 4692. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 33 = 990. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 89 × 49 = 4361. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 554 + 376 = 934. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 632 + 639 = 1271. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 768 + 340 = 1108. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 99 × 47 = 4658. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 851 + 707 = 1553. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 412 + 677 = 1089. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 264 + 630 = 901. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 253 + 693 = 950. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 427 + 314 = 741. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 49 × 39 = 1910. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 99 × 33 = 3269. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 214 + 129 = 343. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 785 + 891 = 1673. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 138 + 373 = 511. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 320 + 445 = 765. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 16 × 56 = 896. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 15 = 555. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 74 × 94 = 6959. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 292 + 784 = 1070. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 75 × 60 = 4500. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 36 × 82 = 2960. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 473 + 521 = 996. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 92 × 99 = 9106. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 19 = 513. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 341 + 883 = 1231. Correct or wrong? (a) correct (b) wrong

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