By adding and subtracting fractions using real scenarios and measuring tools, students can see and understand how relevant and applicable these skills are in a healthcare setting.
At the end of this lesson, students will be able to:
add and subtract fractions with like and unlike denominators
borrow when subtracting fractions
use visual models and appropriate tools to show thinking
solve word problems with fractions
Student Target
I can add and subtract fractions with like and unlike denominators.
CCR Focus Standards
Number and Ratios - Level C
Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.
Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)
Supporting Standards
Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, e.g., by using visual fraction models and equations to represent the problem.
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.
Standards for Mathematical Practice
Model with mathematics. (MP.4)
Use appropriate tools strategically. (MP.5)
Attend to precision. (MP.6)
KYAE Employability Standards
E.6 Identify and effectively use skills and materials needed for a particular task.
E.7 Accurately analyze information and respond appropriately.
E.8 Interact with others in a professional manner.
