Tape is 10 feet 2.25 is purchased how much left

Answer 1

7.75 feet is left

10 = 10.00. subtract

2.25

5 from 10 = 5 for the hundredths digit

2 from 9 = 7 for the tenths digit

9-2 = 7 for the one's digit

leaving 7.75 as the answer

you have to "borrow" a 1 from the preceding digit, as you want a positive solution. 0-5 = -5, so you borrow a 1 from next door and subtract 5 from 10 to get 5. If you take a 1 from the tens digit, that leaves 9, as you "borrow" again a 1 from the ones digit. 9-2 = 7. that leaves 9 in the ones' digit, so you subtract 9-2 = 7/

check your answer, add 7.75 to 2.25 and it sums to 10

Or you could have done this problem by converting to fractions. 2.25 = 2 1/4 = 9/4

10 = 40/4. 40/4 minus 9/4 = (40-9)/4 = 31/4 = 7 3/4 = 7.75

Another way to check the answer is use the "rule of nines"

add up the digits: treat 10 as 1+0 = 1

treat 2.25 as 2+2+5 = 9

add 1+9 = 10, treat it as 1+0 = 1

then compare that to the answer

7.75 as 7+7+5 = 19 as 1+9 = 10 as 1+0 =1

1 = 1, it doesn't prove you're right but odds are now 9 out 10 chance you did it right.