Math 1 · Unit 8 · Lesson 2 · part 5 of 5
Practice Problems
Try them, get help one step at a time, then print how it went.
Practice: try it, then get help one step at a time
Rates and factors, reading P and r from an expression, writing the expression from a story, and using the formula. Hint gives a nudge, Show next step shows one worked step at a time with the calculator keys, Reveal answer checks, and Hide help / start over clears the card. Power first, then times P. Money to the cent.
My results
Finished the practice? Print a page that shows each question, what you typed or chose, the correct answer, and how it went. Good for showing a teacher or keeping in a folder.
Exit ticket
On paper or an index card. Use the math word and the plain-English word.
- Why is adding 5% the same as multiplying by 1.05?
- In 3000(1.07)t, what are P, the growth factor, and the growth rate?
- $500 at 4% compounded annually for 3 years: the balance, to the cent.
- Is compound interest a line? How can you tell from the yearly interest?
Check your exit ticket
- B + 0.05B = B(1 + 0.05) = B(1.05): keep all of it (times 1) and add 0.05 more.
- P = $3,000; factor 1.07; rate 7%.
- 500(1.04)3 = 500 × 1.124864 = $562.43.
- No. The interest earned grows each year (the rate of change increases); the ratio is constant, so it is exponential.