Compound Interest Cheat Sheet

This week, the plan is to finish learning about compound interest so that we can squeeze in projectile motion next week before starting final exam review the week after. It'll be tight, but that's the goal! Hard to believe there are only a few weeks left.

We started our exponential functions unit learning how to graph exponential functions by building tables, identifying a and b given a table, and writing the equations of exponential graphs with the y-intercept and f(1) highlighted.

We then moved on to compound interest compounding annually, then compounding more often. Today students started a compound interest escape room that covers compounding annually, quarterly, monthly, and daily. The escape room also comes as self-checking digital, but we used the printable version. It's more forgiving and keeps students offline.

Today, I made students this exponential functions cheat sheet that they can use as we finish up the escape room, exponential decay, and on their upcoming quiz as an IEP accommodation.

For decay, I may also give students this friendly percents reference depending on how things go. We may just stick with (1 - r), but I'd like them to have another perspective for finding the base of decay functions.

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2 Percent of a Number Cheat Sheets

In this post, there are two free percent of a number cheat sheets for a consumer math unit on calculating percentages of numbers and calculating discounts. Each can be added to student notebooks as a reference when learning how to calculate percentages.

Percent of a number cheat sheet

The first percent sheet reminds students of the divisor when calculating the percent of a number. For example, We can divide 125 by 5 to find that 25 is 20% of 125. This sheet prints on half a page to fit into a student notebook.

Friendly percentages cheat sheet

The second is a friendly percentages reference that's helpful for calculating discounts. If a shirt is 15% off, we can calculate the shirt's price by finding 85% of the original cost of the shirt. I always find this easier than calculating 15% then subtracting that amount from the original price.

This friendly percentages sheet can also be referenced during an exponentials unit when calculating decay. If the value of a car is depreciating by 15% per year, we can use .85 as the exponential's base.

Percent of a Number Cheat Sheets

The two sheets are found free in the same download here: Free percent of a number cheat sheets

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How to Write an Exponential Function Equation Reference Sheet

It's almost the Massachusetts version of spring break here (April vacation), term 4 just started (hard to believe!) and we just began on our exponentials unit in algebra 2. This is going to be a super short post just to share a cheat sheet to help students remember how to write an exponential function equation given two points.

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The sheet walks students through how to write exponential function equations from a table of values, including the y-intercept and one other point. Students are shown how to solve for the exponential's base b, then how to write the equation using this base and information from the table.

You can download this cheat sheet free here.

Normal Distribution Curve Reference Sheet in Algebra 2 Statistics

 

We started our statistics unit in algebra 2 and so far have reviewed box and whiskers plots, dot plots, histograms and learned about skewed data, interquartile range and experimental vs. observational studies. Last week, we started learning about normal distribution and will be on this topic for a little while. We move onto z scores tomorrow.

We gave students a simplified version of the curve with whole number percentages to make calculations easier to manage. I wanted to share this reference with you in case it would be helpful for your students, too. If you'd rather keep the decimals in the percentages, there's also a blank curve in the file.

We printed a bunch on this orange paper (the orange reminded me of that funny normal distribution ghost meme) and laminated them so that students can write on their curves while working.

You can download this normal curve reference here from my Google Drive.

Probability error analysis

If you teach probability, I recently made a "2 truths and a lie" error analysis activity that covers independent and dependent compound probability.

Data and Statistics Activity

Before we got into symmetrical data analysis, we reviewed skewed data and completed this data and statistics activity. It covers mean, median, mode, skew, histograms, dot plots and box and whiskers plots.

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Factoring Trinomials with Algebra Tiles Visual Guide

This week, I worked on a visual guide for how to factor quadratic trinomials using algebra tiles. It has 10 examples, and each example includes the number of tiles needed with any zero pairs, notes about the example and a common student misconception about arranging the tiles for that trinomial. 

Rounding Decimals Escape Room

A few weeks ago, I shared a free rounding money cheat sheet that a teacher had asked me to make. Then just last week, a neighbor asked if I could help her daughter with her rounding whole numbers homework. It seems everyone is rounding all of a sudden! 

In this post, I want to share a new rounding decimals math escape room. There's also a special code below:)

Solving equations visually using cut paper algebra tiles

Algebra tiles help make math visual for students, and paper algebra tiles take it a step further because we can cut them into fractions. In this post are a few short cut paper algebra tiles videos for solving 1-step and 2-step equations that include when x is a fraction.

This first equation is a simple 1-step equation where x is being divided by 4.

 

Next up is another 1-step equation where the coefficient of x is a negative fraction.