按规律填数
1. 376 377
382
2. 3450 3460
3510
3. 5600 5700
6100

照样子,填一填
4652 = 4000 + 600 + 50 + 2
4306 = () + () + ()
5060 = () + ()
6754 = () + () + () + ()
连一连

算一算
80 + 60 =
1000 - 300 =
150 - 80 =
800 + 200 =
6000 + 900 =
500 - 400 =
1900 - 1000 =
1300 - 500 =
4000 - 3000 =
数学乐园
把100,200,300,400,500,600,700这七个数分别填入下面的○里,使每条线上的三个数相加的和均是1000,你会填吗?

1. 378 379 380 381
2. 3470 3480 3490 3500
3. 5800 5900 6000 6200
4306 = 4000 + 300 + 6
5060 = 5000 + 60
6754 = 6000 + 700 + 50 + 4
80 + 60 = 140
1000 - 300 = 700
150 - 80 = 70
800 + 200 = 1000
6000 + 900 = 6900
500 - 400 = 100
1900 - 1000 = 900
1300 - 500 = 800
4000 - 3000 = 1000