Question

Tính nhẩm:

a) 3000 + 5000 = ..........

      5000 + 5000 = ..........

      4000 + 4000 = ..........

      7000 + 2000 = ..........

      6000 + 1000 = ..........

      2000 + 8000 = ..........

b) 2000 + 700 = ..........

      100 + 1000 = ..........

      6000 + 600 = ..........

      8000 + 500 = ..........

      5000 + 300 = ..........

      400 + 6000 = ..........

 

Answer 1

a) 3000 + 5000 = 8000

      5000 + 5000 = 10 000

      4000 + 4000 = 8000

      7000 + 2000 = 9000

      6000 + 1000 = 7000

      2000 + 8000 = 10 000

b) 2000 + 700 = 2700

      100 + 1000 = 1100

      6000 + 600 = 6600

      8000 + 500 = 8500

      5000 + 300 = 5300

      400 + 6000 = 6400

Answer 2

a) 3000+5000=8000

5000+5000=10000

4000+4000=8000

7000+2000=9000

6000+1000=7000

2000+8000=10000

b) 2000+700=2700

100+1000=1100

6000+600=6600

8000+500=8500

5000+300=5300

400+6000=6400

Answer 3

a) 3000 + 5000 = 8000

      5000 + 5000 = 10000

      4000 + 4000 =8000

      7000 + 2000 = 9000

      6000 + 1000 = 7000

      2000 + 8000 = 10000

b) 2000 + 700 = 9000

      100 + 1000 = 1100

      6000 + 600 =12000

      8000 + 500 = 13000

      5000 + 300 = 5300

      400 + 6000 = 6400

Answer 4

a) 3000 + 5000 = 8000

      5000 + 5000 = 10 000

      4000 + 4000 = 8000

      7000 + 2000 = 9000

      6000 + 1000 = 7000

      2000 + 8000 = 10 000

b) 2000 + 700 = 2700

      100 + 1000 = 1100

      6000 + 600 = 6600

      8000 + 500 = 8500

      5000 + 300 = 5300

      400 + 6000 = 6400

 

Answer 5

a) 3000 + 5000 = 8000

      5000 + 5000 = 10 000

      4000 + 4000 = 8000

      7000 + 2000 = 9000

      6000 + 1000 = 7000

      2000 + 8000 = 10 000

b) 2000 + 700 = 2700

      100 + 1000 = 1100

      6000 + 600 = 6600

      8000 + 500 = 8500

      5000 + 300 = 5300

      400 + 6000 = 6400