1 and 3.
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1 and 3
2 goes into 4. 3 goes into 6 or 9. 5 goes into 10, 15, 20, 25, 30. 7 goes into 14, 21, 28.
36 - 21 = 1536 - 21 = 1536 - 21 = 1536 - 21 = 15
315/21 = 15, hence 15 times 21 is 315
21 goes into 126 6times 21 goes into 189 9times gcf =21