9 tens are = to 90.
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90 + 7 is not and has never been equal to 70 + 9
To convert ones to tens, you need to divide by 10. In this case, 90 ones divided by 10 equals 9 tens. Each ten is equivalent to 10 ones, so 90 ones is equal to 9 tens.
of course 50 tens equal 500! 10 tens equal 100.
To determine how many tens are equal to 156, we divide 156 by 10. This division results in 15.6, which means that 156 is equal to 15 tens with a remainder of 6. Therefore, 156 is equal to 15 tens.
6 tens