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1/3 +1/40 +4/20 +5/12

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- $$\sf{ \frac{1}{3} + \frac{1}{40} + \frac{ \red{\cancel{4}}}{ \red{\cancel{20}}} + \frac{5}{12} }$$
- cross out the common factor
- $$\sf{ \frac{1}{3} + \frac{1}{40} + \frac{1}{5} + \frac{5}{12} }$$
- Find common denominator and write the numerators above common denominator
- $$\sf{ \frac{40}{3 \times 40} + \frac{3}{40 \times 3} + \frac{3 \times 8}{5 \times 24} + \frac{5 \times 10}{12 \times 10} }$$
- calculate the product or quotient
- $$\sf{ \frac{40}{120} + \frac{3}{120} + \frac{24}{120} + \frac{50}{120} }$$
- write the numerator over common denominator
- $$\sf{ \frac{40 \: + \: 3 \: + \: 24 \: + \: 50 }{120} }$$
- calculate the sum or difference
- $$\sf{ \frac{117}{120} }$$
- cross out the common factor
- $$\sf{ \frac{39}{40} }$$