Question

There are 145 red straws and 228 blue straws in a bag. How many total straws are there in the bag?

Answer 1

We add 145 and 228 by expansion method.
$\bullet$ We expand 145 and 228 as follows:
$145=100+40+5$
$128=100+20+8$


$\bullet$ For ones place,we add 5 and 8 to give 13 or 13 ones.
$5+8=13$
13 ones can be regrouped as 1 tens (10) and 3 ones (3).
$\bullet$ For tens place, we add 10, 40, and 20.
$10+40+20=70$
$\bullet$ For hundreds place, we add 100 and 200.
$100+200=300$
​​​​​​​ $\bullet$ Hence, we get $145+228=373$.
​​​​​​​ $\bullet$ There are a total of 373 straws in the bag.
Option C is the correct answer.