40 tens regroup through tens

1. 40 tens regroup to tens

40 tens = 40 x 10, because it says 40 tens

so how many tens are there in 400

=> 400 divided by 10

=> 400 / 10

=> 40

Thus, we will regroup 40, by tens 4 times to get the answer

=> 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10

There are 40 10s in 40 tens

Thus the answer when we add this 40 tens is 400