Evaluating algebraic expressions

Everything You Need in One Place

Homework problems? Exam preparation? Trying to grasp a concept or just brushing up the basics? Our extensive help & practice library have got you covered.

Learn and Practice With Ease

Our proven video lessons ease you through problems quickly, and you get tonnes of friendly practice on questions that trip students up on tests and finals.

Instant and Unlimited Help

Our personalized learning platform enables you to instantly find the exact walkthrough to your specific type of question. Activate unlimited help now!

0/1
?
Intros
Lessons
  1. i) What are variables?

    ii) What is an expression?

0/10
?
Examples
Lessons
  1. Below we have used ponds and tadpoles to model an expression. Write the expression and use the variable x to represent the unknown number of tadpoles in each pond.

    1. Evaluating algebraic expressions using models

    2. Expressing algebraic expressions in models

    3. Writing the algebraic expressions represented as a model
  2. Mary bought ss packages of stickers, and there are 10 stickers in each package. Write an expression to show how many stickers Mary bought.
    1. Write an expression for each phrase. Then, evaluate the expression.
      1. 10 pounds lighter than Molly (m), when m=100
      2. 22 years older than Tracy (t), when t = 10.
      3. 17 less than 5 times a number (n), when n = 7
    2. Evaluate the following expression, if x=7x = 7 and y=9y = 9
      1. 6xy+56x-y+5
      2. 23x+16y1 \frac{2}{3}x+\frac{1}{6}y-1
      3. 0.5x0.1+1.3y0.5x-0.1+1.3y
    0%
    ?
    Practice
    Free to Join!
    StudyPug is a learning help platform covering math and science from grade 4 all the way to second year university. Our video tutorials, unlimited practice problems, and step-by-step explanations provide you or your child with all the help you need to master concepts. On top of that, it's fun - with achievements, customizable avatars, and awards to keep you motivated.
    • Easily See Your Progress

      We track the progress you've made on a topic so you know what you've done. From the course view you can easily see what topics have what and the progress you've made on them. Fill the rings to completely master that section or mouse over the icon to see more details.
    • Make Use of Our Learning Aids

      Last Viewed
      Practice Accuracy
      Suggested Tasks

      Get quick access to the topic you're currently learning.

      See how well your practice sessions are going over time.

      Stay on track with our daily recommendations.

    • Earn Achievements as You Learn

      Make the most of your time as you use StudyPug to help you achieve your goals. Earn fun little badges the more you watch, practice, and use our service.
    • Create and Customize Your Avatar

      Play with our fun little avatar builder to create and customize your own avatar on StudyPug. Choose your face, eye colour, hair colour and style, and background. Unlock more options the more you use StudyPug.
    Topic Notes
    ?
    In this section, we are given models of cups and counters and asked to write the expressions represented by these models. We then use the variable x to represent the number of counters in each cup. We were first taught how to write expressions and solve for variables in a previous section. In this section, we are also asked to draw cup and counter models of given expressions. Finally, we are asked to write expressions for given phrases and evaluate the expressions using our variables.