does anyone have any good idea on how to learn subtacting decimals. where there is alot of borrowing involved?
Simplify the problem by adding a number to the number you are subtracting. After you obtain the answer, correct for that by adding that number, which you have subtrcted extra, back.
Subtracting decimals using the standard method taught in primary school is error prone if you have to deal with a lot of "borrowing". If you make a mistake, then that mistake will propagate to the next step.
Example:
Calculate 1232 - 878
Let's add to 878 the number 122 so that it becomes 1000. It is far easier to calculate 1232 - 1000 than 1232 - 878.
1232 - 1000 = 232
Of course, we have now subtracted an extra term of 122, so we have to add that to 232 to obtain the answer:
232 + 122 = 354
HUH??????????? IDK
Learning how to subtract decimals with borrowing can be challenging at first, but with practice, it becomes easier. Here's a step-by-step method on how to subtract decimals with borrowing:
Step 1: Align the decimals - Place the decimals vertically, making sure the decimal points are lined up.
Step 2: Borrow if necessary - Start by subtracting the digits to the right of the decimal point. If the top digit is smaller than the bottom digit, you need to borrow from the digit to the left. For example, when subtracting 9 from 1 (0.9 - 0.01), you need to borrow from the digit to the left.
Step 3: Subtract the digits to the right - Subtract the digits to the right of the decimal point, just like you would with whole numbers. If borrowing was required in the previous step, adjust the numbers accordingly.
Step 4: Subtract the digits to the left - Move to the left of the decimal point and subtract the whole numbers. Borrow if necessary, as you would with whole numbers.
Step 5: Place the decimal point - Once you have subtracted all the digits, place the decimal point in the answer directly below the decimal points in the original numbers.
Step 6: Simplify the answer if needed - Review the answer and see if you can simplify it by removing any trailing zeroes or insignificant digits.
To practice this method, you can find worksheets or online exercises specifically designed for subtracting decimals with borrowing. Additionally, using manipulatives like base-ten blocks or a number line can help visualize the concept. Regular practice will build your confidence and improve your skills in subtracting decimals with borrowing.