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70 tens = 70 x 10 = 700
700 hundreds is 70,000. 70,000 contains 7,000 tens.
7
70 of them.
700
100 + 70
9 tens is 90. 90 of 70 is 630.
700 ÷ 10 = 70
70
702 tens.
7 tens, or 70.