30 x 80 = 2400
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34 x 28 = 34 x (20 + 8) First partial product is: (30 + 4) x 8 = 240 + 32 Second partial product is: (30 + 4) x 20 = 600 + 80 Sum of partial products = total product = 600 + 240 + 80 + 32 = 952
2400 ÷ 80 = 30
30
Halfway between 30 and 80 is (30 + 80) ÷ 2 = 55.
3/8 of 80 is 30