A) 3 2/3 - 1 5/12 we’ll convert to 12ths by multiplying the numerator and denominator of the first mixed number by 4. 3 8/12 - 1 5/12 = 2 3/12 = 2 1/4
b) 3 3/10 - 1 4/5 we’ll convert to 10ths by multiplying the numerator and denominator of the second mixed number by two.
3 3/10 - 1 8/10 Now we need to borrow from the three wholes to create more tenths 2 13/10 - 1 8/10 = 1 5/10 = 1 1/2
Or you can convert the first one to 33/10, and the second one to 9/5, which becomes 18/10. 33/10 - 18/10 = 15/10 = 1 1/2 Do whichever one makes more sense to your brain.
c) 4 5/9 - 3 1/2 we will convert both to 18ths. 4 10/18 - 3 9/18 = 1 1/18
d) 7 5/6 - 2 1/4 we will convert both to 12ths. 7 10/12 - 2 3/12 = 5 7/12
Please let me know if you have questions on these.
