4×2=8 8×3/14=25/12.
25/12÷4=6/28+4+4=14/28
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10×2=20 20×3/14=62/8. 62/8÷4=15/7 ×3=47/1+10+10=67/1
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10×2=20 20×3/14=62/8 62/8 ÷2=31/4
10×3/14=31/4
31/4. 62/8+10=72/8
+
31/4
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62/8