Understand a multiple of 𝑎/𝑏 as a multiple of 1/𝑏 and use this understanding to multiply a fraction by a whole number.
Add and subtract mixed numbers with like denominators.
Decomposing a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions.
Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
Understand a fraction 𝑎/𝑏 with 𝑎 > 1 as a sum of fractions 1/𝑏.
Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.
Understand a fraction 𝑎/𝑏 as a multiple of 1/𝑏.