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80% = 0,8= ⁸/₁₀
⁸/₁₀ × 1 ⁴/₁₅ = ⁷⁶/₂₅
b)4,7-2¼ = 4,7-2,25=2,45
250% = 2,5
2,5 * 2,45 = 6,125
c)2,6-1¾ = 2,6-1,75= 0,85
3 1/2-2 1/3= 3 ³/₆ - 2²/₆ = 1 ⅙
0,85/ 1⅙ = ¹⁷/₂₀ ×⁶/₇ = ¹⁰²/₁₄₀= ⁵¹/₇₀
⁵¹/₇₀ * 45% = ⁵¹/₇₀ * ⁴⁵/₁₀₀ = ²²⁹⁵/₇₀₀₀= ⁴⁵⁹/₁₄₀₀