Description
This is a complete lesson for learning how to identify proportional relationships. Two ratios are in a proportional relationship if they are equivalent.
20/28 = 45/63
Students will find if these ratios are in a proportional relationship by cross-multiplying. Multiply the numerator of the first ratio times the denominator of the second (20 x 63 = 1260), and the denominator of the first times to the numerator of the second (28 x 45 = 1260.) Since 1260 does equal 1260, the ratios are in a proportional relationship.
However, consider these two ratios: 10/26 = 25/60
Cross-multiplying results in this: 600 ≠ 650. 600 does not equal 650, so these ratios are not in a proportional relationship.
It includes a set of Guided Notes for understanding how to solve these types of problems, two online check-ins using Google Forms, and a worksheet. The worksheet can be used for in-class practice or for homework. I recommend using the Guided Notes first to show students how to find proportional relationships. The students can then use Check Ins 3 and 4 and the worksheet to practice. Check in 4 uses only word problems. For the Guided Notes, the students will use copies without the terms filled in, and you can teach using the Answers/Completed Work document.
All resources except the Check Ins can be used either as printouts or online through Google Classroom. The Check Ins are only online.
To check the quality of my work for free before buying, please try any of these products:
Highlights
Description
This is a complete lesson for learning how to identify proportional relationships. Two ratios are in a proportional relationship if they are equivalent.
20/28 = 45/63
Students will find if these ratios are in a proportional relationship by cross-multiplying. Multiply the numerator of the first ratio times the denominator of the second (20 x 63 = 1260), and the denominator of the first times to the numerator of the second (28 x 45 = 1260.) Since 1260 does equal 1260, the ratios are in a proportional relationship.
However, consider these two ratios: 10/26 = 25/60
Cross-multiplying results in this: 600 ≠ 650. 600 does not equal 650, so these ratios are not in a proportional relationship.
It includes a set of Guided Notes for understanding how to solve these types of problems, two online check-ins using Google Forms, and a worksheet. The worksheet can be used for in-class practice or for homework. I recommend using the Guided Notes first to show students how to find proportional relationships. The students can then use Check Ins 3 and 4 and the worksheet to practice. Check in 4 uses only word problems. For the Guided Notes, the students will use copies without the terms filled in, and you can teach using the Answers/Completed Work document.
All resources except the Check Ins can be used either as printouts or online through Google Classroom. The Check Ins are only online.
To check the quality of my work for free before buying, please try any of these products:
