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2/5 × 15/6 = 30/30 = 1. ( yang a)
1 1/2 ×3/4 = 3/2 ×3/4 = 9/8 = 1 1/8. (yang b)
2/3 × 6/8 × 16/32. (16/32 disederhanakan menjadi 1/2 sementara 6/8 disederhanakan menjadi 3/4) = 2/3 × 3/4 × 1/2 = 6/24 = 1/4(yang c)

A. 2/5×15/6
=30/30
=1
B. 1 1/2×3/4
=3/2×3/4
=9/8
=1 1/8
C. 2/3×6/8×16/32
=2/3×3/4(disederhanakan)×
1/2(disederhanakan)
=6/24
=1/4
D. 1 1/2×2 2/3×3 3/4
=3/2×8/3×15/4
=135/24
=15