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Can someone explain how to do this math?

Can Someone Explain How To Do This Math class=

Sagot :

Answer:

Carlos subtracted 2 tens, not 3 tens.

Explanation:

In step 1, there are 90 blocks divided into 9 tens. However in step 2, Carlos mistakenly subtracted only 2 tens which is equivalent to 20 blocks. It should be 3 tens which is equivalent to 30 blocks. Although, he is right in subtracting 4 ones which is equivalent to 4 blocks.

1 ten = 10 blocks

2 tens = 20 blocks

3 tens = 30 blocks

and so on...

So, Carlos should subtracted 3 tens and 4 ones.