Question

Charlie and Mary are baking cookies for their mother's birthday! They have to bake $359$ cookies in total. Charlie bakes $132$ cookies. Mary bakes $178$ cookies. How many cookies they have to bake more.

• A. $315$
• B. $310$
• C. $49$
• D. $46$

Answer 1

The correct option is C $49$

Total cookies baked by Charlie and Mary till now
= Addition of $132$ and $178$
= $132$ + $178$


Adding ones , $2+8=10$
$10$ ones = $1$ tens + $0$ ones
Thus, we place $0$ at ones place and carry $1$ tens to tens place .

$1+3+7=4+7=11$ tens
$11$ tens = $1$ hundred + $1$ tens
Place $1$ tens at tens place.
For hundreds , $1+1+1=2+1=3$

Thus, Charlie and mary have baked $310$ cookies till now.

Total cookies need to be baked =$359$
Cookies baked till now = $310$
Cookies left to be baked = $359-310$


Subtracing $310$ from $359$ we get $49$.

Thus, Charlie and Mary have to bake $49$ cookies more.