Total = + 4 + ( + 4) + 8 + + ( + 8) + ( + 8) + ( + 4) + 16

= 3$\times$ + 3$\times$ + 52

Bottom row (or last column):

( + 8) + ( + 4) = 16, so + + 12 = 16, so + = 4

Then, multiplying by 3,

3$\times$ + 3$\times$ = 12

So Total = 12 + 52 = 64

Reds add up to 16

Yellows add up to 16 Purples add up to yellows

Total = 16$\times$4 = 64

You can find more short problems, arranged by curriculum topic, in our short problems collection.