Môn Toán Lớp 5: 1.
a) 3,5+4,67+6,5+5,33
b) 12,51+23,24+87,49
c) 0,19+8,35+0,81+1,65
d) 2022+19,8+7978+80,2
e) 99+1,53+0,01+1,47
Môn Toán Lớp 5: 1.
a) 3,5+4,67+6,5+5,33
b) 12,51+23,24+87,49
c) 0,19+8,35+0,81+1,65
d) 2022+19,8+7978+80,2
e) 99+1,53+0,01+1,47
a) 3,5+4,67+6,5+5,33= (3,5+6,5)+(4,67+5,33)
=10+10
=20
b)12,51+23,24+87,49= 35,75+87,49
= 123,24
c) 0,19+8,35+0,81+1,65= (0,19+0,81)+(8,35+1,65)
= 1 + 10
= 11
d) 2022+19,8+7978+80,2 = (2022+7978) + (19,8+80,2)
= 10000 + 100
= 10100
e) 99+1,53+0,01+1,47= (99+0,01) +(1,53+1,47)
= 99,01 + 3
= 102,01