you carry when the answer in the ones place is 10 or more. like 49+17 9 and seven are sixteen 6 in the ones 1 in the tens only addition
you borrow when subtraction is the ones first number you add like... 74-25 borrow one from seven and it becomes six now the 4 is 14 so 14 minus five what is it OK now subtract the tens you have learned how to carry and borrow
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principal(in terms of math)- the amount you borrow or deposit
Borrowing is the act of taking with intentions of returning it. If you borrow money, most people will charge interest on the money. Most banks charge interest yearly, sometimes monthly. The interest depends on who or where you borrow the money from.
You can locate many math fair project ideas on the internet. Just type in math fair project ideas junior high and many ideas will come up. You can also order a book or borrow one from the library of projects.
"Julia, may I borrow your eraser?"
in subtraction if dealing with multi-digit problems such as 100 - 73 first you borrow from the 1 in 100 making the 1 a 0 making the first 0 a 10 then borrow from that 10 and make it a 9 and turn the second 0 a 10.... if this makes sense then you are set, but if not, example below 0910 100 -73 ____