4. 4+2+3+1=10
80÷10=8
4×8 = 32
2×8 = 16
3×8 = 24
1×8 = 8
32+16+24+8 = 80
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4. 4+2+3+1=10
80÷10=8
4×8 = 32
2×8 = 16
3×8 = 24
1×8 = 8
32+16+24+8 = 80