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17
---- x
168 --> (4x7)+ (20x7)=28+140=168
24 --> 20x1=20, 4x1=4, 20+4=24
---- +
408
b. 32
24
----- x
128 ------> 2x4=8, 30x4 =120 , 8+120=128
64 ------> 30x2=60,2x2=4, 60+4=64
------- +
768
c. 13
45
------- x
65 ------> 3x5=15, 10x5=50,15+50=65
52 ------>3x4=12,10x4=40, 12+40=52
--------- +
585