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\[Volume{\text{ }} = {\text{ }}length \times width\; \times height\]

Volume of a cubical box can be found out by

\[Volume{\text{ }} = {\text{ }}length \times length\; \times length\]

The box is \[3\] inches high so you can put a second layer of \[30\] blocks on top of the first layer and then a third layer of \[30\] blocks to fill the box. Hence you have filled the box with \[3 \times \;30{\text{ }} = {\text{ }}90\], one cubic inch blocks.

Hence the volume of the box is \[36\] cubic inches and you obtained the number \[90\] from \[6 \times \;5 \times 3{\text{ }} = {\text{ }}90\] that is the length times the width times the height.

Also, we can use the formula \[Volume{\text{ }} = {\text{ }}length \times width\; \times height\]

to calculate the volume of the box, which is \[90\]

Width= \[5\] inch- \[5\] cube will fill. Height=\[3\] inch- \[3\] cube will fill.

So, total number of cubes is\[6 \times \;5 \times 3{\text{ }} = {\text{ }}90\]

The number of One-inch cubes that can be filled in a bigger one can be calculated just by dividing the volume of the bigger box with the smaller one.