CPM Homework Help : CC1MN Problem 2-46

Draw a generic rectangle to help you calculate each product. For each part, write: (total dimension)(total dimension) $=$ sum of individual area parts $=$ total area. For example, the diagram at right shows that $(12)(27)=200+40+70+14=324$ .

$( 73 ) ( 42 )$

Hint (a):
Think back to the way you solved the generic rectangles in class. Change $73$ to $70 + 3$ . Change $42$ to $40 + 2$ .
Partial Answer (a):
Part of the rectangle has been filled in for you.

Generic rectangle
top edge left $70$
top edge right blank
left edge top blank
interior top left $2800$
interior top right blank
left edge bottom $2$
interior bottom left blank
interior bottom right $6$

$125 \cdot 81$
Hint (b):
This one is solved just like the one at left. Remember to add a hundreds place column.

Generic rectangle

top edge left $10$

top edge right $+2$

left edge top $20$

interior top left $200$

interior top right $40$

left edge bottom $+7$

interior bottom left $70$

interior bottom right $14$