Answer :

0000000
[tex]\sf 2 \frac{1}{4}= \frac{2*4+1}{4}= \frac{9}{4}=2,25 \\ \\ 2,25+0,15=\boxed{\sf 2,40} \\ \\ \\ \\ 6,5= \frac{65}{10}^{(5}= \frac{13}{2} \\ \\ ^{3)}\frac{13}{2}+ \frac{5}{6}= \frac{39+5}{6}= \frac{44}{6}= \boxed{\sf 7,(3)} [/tex]

2 1/4= 2.25 because you divide 1 by 4 to get .25 and 2 is a whole number

then just add and make sure the decimals are lined up: 2.25+0.15=2.40

b. 6.5 is equal to 6 1/2  to add you need to get common denominators so make 1/2 3/6 because then you will have common denominators and now just add: 6 3/6 + 5/6=6 8/6

finally you simplify the fraction because it is not: 8/6=1 2/6 simplify again and add=

1 1/3 +6=7 1/3

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