standard_description: Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.
problem_activity: A florist shop is preparing bundles of flowers to sell over the weekend. In a bundle of flowers, the shop uses 3 roses for every 4 carnations. Create a table of equivalent ratios to represent the relationship between roses and carnations in the bundles of flowers.
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