40x2=80 45x1=45 50x1=50
40x3=120 45x2=90 50x2=100
40x4=160 45x3=135 50x3=150
40x5=200 45x4=180 50x4=200
40x6=240 45x5=225 50x5=250
40x7=280 45x6=270 50x6=300
40x8=320 45x7=315 50x7=350
40x9=360 45x8=360 50x8=400
40x10=400 45x9=405 50x9=450
45x10=450 50x10=500
40 x 4= 160
40 x 5= 200
40 x 6= 240
40 x 7= 280
40 x 8= 320
40 x 9= 360
40x1=40 45x1=45 50x1=50
40x2=80 45x2=90 50x2=100
40x3=120 45x3=135 50x3=150
40x4=? 45x4=? 50x4=?
40x5=? 45x5=? 50x5=?
40x6=? 45x6=? 50x6=?
40x7=? 45x7=? 50x7=?
40x8=? 45x8=? 50x8=?
40x9=? 45x9=? 50x9=?
40x10=400 45x10=450 50x10=500
tính :
24x2=
45x7=
12x8=
94x3=
45x4=
54x2=
Viết các số sau thành số la mã :
50 , 100 , 500 , 1000, 90 , 400 , 40 , 900 ,
90+10-50x2+49=?
Tính giá trị của biểu thức:
a) 90 – ( 30 – 20) = ..........................
= ..........................
90 – 30 – 20 = ..........................
= ..........................
b) 100 – (60 + 10) = ..........................
= ..........................
100 - 60 + 10 = ..........................
= ..........................
c) 135 – (30 + 5) = ..........................
= ..........................
135 – 30 – 5 = ..........................
= ..........................
d) 70 + (40 – 10) = ..........................
= ..........................
70 + 40 – 10 = ..........................
= ..........................
Tính nhẩm:
a) 500 + 400 = .......
900 – 400 = .......
900 – 500 = .......
b) 700 + 50 = .......
750 – 50 = .......
750 – 700 = .......
c) 300 + 40 + 6 = .......
300 + 40 = .......
300 + 6 = ......
Tính nhẩm:
a) 400 + 300 =
700 – 300 =
700 – 400 =
b) 500 + 40 =
540 – 40 =
540 – 500 =
c) 100 + 20 + 4 =
300 + 60 + 7 =
800 + 10 + 5 =
40x70+40x10+40x20=?
tìm y
y:2=30:5
y:45=365-98
450:y=80+10
91:y=9x9
