standard_description: Explain why a fraction a/b is equivalent to a fraction (n × a)/(n × b) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.
Grade 4 expectations in this domain are limited to fractions with denominators 2, 3, 4, 5, 6, 8, 10, 12, and 100.
problem_activity: Problem 1
Solve. Show or explain your work.
$${2{5\over8}+4{2\over3}}$$
Problem 2
Sang needs
$$3\tfrac{1}{2}$$
feet of string to make a necklace and
$$2\tfrac{1}{4}$$
feet of string left. How much string, in feet, did Sang have before making the necklace?


aligns: no