Two with one remaining
21 - 1 = 20 = 10 x 2
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10 with remainder 10.
30 times with a remainder of 10
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.
10 x 21 = 210 with a remainder of 12
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.