Well, honey, let me break it down for you. 30 ones is definitely not the same as 30 tens. In the first scenario, you've got 30 individual ones, while in the second, you've got 3 groups of 10. So, to put it simply, they may have the same numerical value, but they sure ain't the same thing.
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No, 30 ones is not the same as 30 tens. In our base-10 number system, each place value is 10 times greater than the one to its right. So, 30 ones is equal to the number 30, while 30 tens is equal to the number 300. The difference in value is due to the positional notation system we use in mathematics.
30
99
3 tens is 30 16 ones is 16 30 + 16 = 46 So the answer is b.
80
90 + 7 is not and has never been equal to 70 + 9