(82+18)+(30+70)+(23+27)+50
=100+100+50+50
=300
cich cho minh nha
18+23+70+27+50+30+82 = ( 70 + 30 ) + ( 50 + 23 + 27 ) + ( 82 + 18 ) = 100 + 100 + 100 = 300
18+23+70+27+50+30+82=300
(82+18)+(30+70)+(23+27)+50
=100+100+50+50
=300
cich cho minh nha
18+23+70+27+50+30+82 = ( 70 + 30 ) + ( 50 + 23 + 27 ) + ( 82 + 18 ) = 100 + 100 + 100 = 300
18+23+70+27+50+30+82=300
Điền dấu >, <, = vào chỗ chấm
47 … 45 | 34 … 50 | 10 … 18 – 8 |
81 … 82 | 78 … 69 | 44 … 30 + 10 |
95 … 90 | 72 … 81 | 70 … 90 – 20 |
61 … 63 | 62 … 26 | 77 … 90 – 10 |
Tính nhẩm:
48 – 40 = … | 69 – 60 = … | 82 – 70 = … |
58 – 30 = … | 79 – 50 = … | 34 – 20 = … |
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
Tính nhẩm:
30 + 6 = 60 + 9 = 52 + 6 = 82 + 3 =
40 + 5 = 70 + 2 = 6 + 52= 3 + 82 =
20+7=
37+3=
12+9=
10+30=
90-70=
23+7=
10+8=
27-9=
45-10=
59-27=
81-10=
28+16=
29+12=
71-12-
Tính nhẩm :
20 + 30 = ?
Vậy 20 + 30 = 50
50 + 10 = 40 + 30 = 50 + 40 =
20 + 20 = 20 + 60 = 40 + 50 =
30 + 50 = 70 + 20 = 20 + 70 =
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30=
Điền dấu >; < ; = vào chỗ chấm
80 … 70 | 10 … 60 | 80 … 50 |
20 … 40 | 70 … 40 | 50 … 80 |
50 … 90 | 30 … 80 | 50 … 50 |
Tính nhẩm:
a)
60 + 20 = 80 - 20 = 40 + 50 =
70 + 10 = 90 - 10 = 90 - 40 =
50 + 30 = 70 - 50 = 90 - 50 =