tolong di jawab yang benar pilihan ganda 1-10

1) a) 12,45 + 17,32 = 29,77
b) 20,08 + 9,4 = 29,48
c) 18,72 + 11,25 = 29,97
d) 15,07 + 14,57 = 29,64
jadi yg terbesar adlh ( C )

2) 3/10 + 0,15
= 0,3 + 0,15
= 0,45 ( B )

3) 4 1/6 + p = 6 ½
p = 6 ½ - 4 1/6
p =( 6 - 4) + ( ½ - 1/6)
p = 2 + ( 3/6 - 1/6)
p = 2 + 2/6
p = 2 2/6
p = 2 ⅓ ( A )

4) 1/8 + 0,75
= ( ⅛ × 125/125) + 0,75
= 125/1000 + 0,75
= 0,125 + 0,75
= 0,875
= 875/1000
= 7/10 ( D )

5) 7 3/10 - 0,6
= 73/10 - 6/10
= 67/10
= 6 7/10 ( C )

7) 1,25 × 6/10
= 1,25 × 0,6
= 0,75 ( A )

8) 0,25 × 1/5 = n
n = 25/100 × 1/5
n = 5/100 × 1
n = 0,05 ( B )

8 )a ) 4,5 ÷ 0,25 = 18 ( benar )
b) 1/5 ÷ 0,5
= 1/5 ÷ 5/10
= 1/5 × 10/5
= 2/5
= 4/10 ( benar )
c) 6,5 ÷ 2,5 = 2,6 ( benar )
d) 3 1/5 ÷ 2/5
= 16/5 × 5/2
= 8
tdk sm dg 1/8 ( salah)
jadi yg salah opsi ( D )

9) 8/15 ÷ 2/5 = p + ⅓
8/15 × 5/2 = p + ⅓
4/3 × 1/1 = p + ⅓
4/3 = p + ⅓
p = 4/3 - ⅓
p = 3/3
p = 1 ( A)

10) ayah : kakak = 8 : 3
selisih umur = 25 th
selisih perbandingan = 8 - 3 = 5
umur kakak = 3/5 × 25 = 15 th
umur kakak 3 th yg lalu = 15 - 3 = 12 th (D)