Fractions are best added when expressed over a common denominator. All of these fractions can be expressed in terms of eighths.

3/4 = (3/4)*(2/2) = (3*2)/(4*2) = 6/8

1/2 = (1/2)*(4/4) = (1*4)/(2*4) = 4/8

3/8 + 3/4 + 1/2 = 3/8 + 6/8 + 4/8 = (3 + 6 + 4)/8 = 13/8

= (8 + 5)/8 = 8/8 + 5/8 = 1 5/8

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I would call this an arithmetic problem. Arithmetic with fractions is often taught in algebra class.

3/4 = (3/4)*(2/2) = (3*2)/(4*2) = 6/8

1/2 = (1/2)*(4/4) = (1*4)/(2*4) = 4/8

3/8 + 3/4 + 1/2 = 3/8 + 6/8 + 4/8 = (3 + 6 + 4)/8 = 13/8

= (8 + 5)/8 = 8/8 + 5/8 = 1 5/8

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I would call this an arithmetic problem. Arithmetic with fractions is often taught in algebra class.