Penjelasan dengan langkah-langkah:

soal 1

2/3 + 1/6 = 4/6 + 1/6 = 5/6

4/5 - 3/4 = (4×4 – 5×3)/(5×4) = 1/20

1/4 x 2/5 = (1×2)/(4×5) = 2/20 = 1/10

3/5 : 1/6 = 3/5 × 6/1 = (3×6)/(5×1) = 18/5

soal 2

ukuran peta = 15cm

skala = 1 : 5.000

ukuran sebenarnya (15 × 5.000)/100 = 750 meter

ukuran sebenarnya =3km

skala = 1 : 1.000

ukuran peta = (3 x 100.000)/1.000 = 300 cm

soal 3

sebuah balok dengan ukuran

panjang 8 lebar 5 tinggi 6 berapa luas permukaan?

Lp = 2 × (p×l + p×t + l×t)

Lp = 2 × (8×5 + 8×6 + 5×6)

Lp = 2 × (40 + 48 + 30)

Lp = 2 × 118

Lp = 236 cm²

soal 4

64 + (-36) = 64 – 36 = 28

(-56) - 43 = – (56+43) = – 99

72 : (-3) = –(72/3) = – (60/3 + 12/3) = –(20 + 4) = –24

(-15) x (-23) = – [–(15 × 23)] = 15 × (20 + 3) = 300 + 45 = 345