1, 2, 5, 10
1, 3, 7, 21
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21 times because 21 times 10 = 210
10 goes into 21 two times, with a remainder of 1. This can be calculated by dividing 21 by 10, which equals 2 with a remainder of 1. So, 10 goes into 21 two times evenly, with 1 left over.
2 goes into 4. 3 goes into 6 or 9. 5 goes into 10, 15, 20, 25, 30. 7 goes into 14, 21, 28.
21 goes into 136 six times. This can be calculated by dividing 136 by 21, which equals 6 with a remainder of 10. Since we are looking for the whole number of times 21 goes into 136, we ignore the remainder.
21 goes into 126 6times 21 goes into 189 9times gcf =21