CCLS - Math: 4.NF.5

Number And Operations—Fractions3
Understand Decimal Notation For Fractions, And Compare Decimal Fractions.
State Standard:
Express a fraction with denominator 10 as an equivalent fraction with denominator 100, and use this technique to add two fractions with respective denominators 10 and 100.4 For example, express 3/10 as 30/100, and add 3/10 + 4/100 = 34/100.