7 x 90 = 80 x 100 =

Step 1: Calculate the first multiplication. $7 \times 90$ Multiply $7$ by $9$ to get $63$, then add the zero from $90$. $7 \times 90 = 630$

Step 2: Calculate the second multiplication. $80 \times 100$ Multiply $8$ by $1$ to get $8$. Then count the total number of zeros in both numbers ($80$ has one zero, $100$ has two zeros, for a total of three zeros) and append them to $8$. $80 \times 100 = 8000$

The solutions are: $7 \times 90 = \text{630}$ $80 \times 100 = \text{8000}$

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