Answer:
Boxes (in order): 7, 40, 100, 1215
Step-by-step explanation:
This is a weird method of multiplication.
Its separating the 27 and 45 into 20, 7 and 40, 5 to multiply in stages.
This is what you should end up doing in your head later on at school.
You then expand the brackets so you multiply each number by 2 other numbers.
Then you add the 4 products to get the final product.
7 because 20 + 7 = 27
40 because its the only number only used once in that line.
100 because 20 x 5 = 100
And 1215 because 800 + 100 + 280 + 35 = 1215
