Note - I am not a math teacher; I am seeking an answer from a math teacher.
While helping my son with his 5th grade homework today we had one answer wrong. I'm not sure I agree with the book and wanted to see if there's a rule on this. The assignment is to write the expression for the phrase.
The problem is 2/3 of 30 minus 11. You can read that two ways: "Two thirds of [pause] thirty minus eleven" "Two thirds of thirty [pause] minus eleven"
Our answer was (2/3 * 30) - 11 and we are aware the parenthesis do not matter here. This also fits with the fact that 30 is divisible by 3. The book's answer is 2/3 * (30 - 11).
Is there a specific reason for this? Misprint?
I'll add that the book lists the answer to 1/4 times 8 increased by 11 as being 1/4 * 8 + 11 which we have correct. Seems quite similar.