Question

3 .Resolva as adições usando o cálculo mental.


$200 + 650 =$
$168 + 500 =$
$3000 + 1845 =$
$1023 + 2040 =$
$3409 + 500 =$
$4569 + 2321 =$
​

Answer 1

resposta:

200+650=850

168+500=668

3000+1845=4845

1023+2040=3023

3409+500=3809

4568+2321=6889