To fill in the blanks for your multiplication and estimation:
First, let's perform the multiplication:
36 x 52
72 (36 multiplied by 2) +1800 (36 multiplied by 50, which is actually 36 x 5 with a zero added)
1872
Now, for the estimation:
Estimate the product to check our work: 40 x 50 = 2000
This is close to 1,872, so our answer is correct.