SKU: 48742338857

Math Mammoth Percent

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Description

Math Mammoth PercentMath Mammoth Percent teaches students the concept of percent, percentage of a number, discounts, sales tax, percent of change, circle graphs, and percent of comparison. It is suitable for 6th 8th grades. The concept of percent builds on the students' understanding of fractions and decimals. Specifically, students should be familiar with the idea of finding a fractional part of a whole (such as finding 3 4 of $240). Assuming the student has mastered

Math Mammoth Percent teaches students the concept of percent, percentage of a number, discounts, sales tax, percent of change, circle graphs, and percent of comparison. It is suitable for 6th-8th grades.

The concept of percent builds on the students' understanding of fractions and decimals. Specifically, students should be familiar with the idea of finding a fractional part of a whole (such as finding 3/4 of $240). Assuming the student has mastered that, and can easily convert fractions to decimals, then studying the concept of percent should not be difficult.

The first lesson, Percent, practices the concept of percent as a hundredth part, and how to write fractions and decimals as percentages. Next, we study how to find a percentage when the part and the whole are given (for example, if 15 out of 25 club members are girls, what percentage of them are girls?).

The following two lessons have to do with finding a certain percentage of a given number or quantity. First, we study how to do that using mental math techniques. For example, students find 10% of $400 by dividing $400 by 10. Next, students find a percentage of a quantity using decimal multiplication, including using a calculator. For example, students find 17% of 45 km by multiplying 0.17 _ 45 km.

I prefer teaching students to calculate percentages of quantities using decimals, instead of using percent proportion or some other method. That is because using decimals is simpler: we simply change the percentage into a decimal, and multiply, instead of having to build a proportion or use fractions.

Next is a lesson about discounts, which is an important application in everyday life. Then, we go on to the lesson Practice with Percent, which contrasts the two types of problems students have already studied: questions that ask for a certain percentage of a number (the percentage is given), and questions that ask for the percentage.

The next major topic is the percentage of change. The concept of percentage of change deals with percentage increases and decreases in quantities (especially prices). Tying in with percentage of change, there is one lesson on Comparing Values Using Percentages.

Simple Interest is a lesson on the important topic of interest, using as a context both loans and savings accounts. Students learn to use the formula I = prt in a great variety of problems and situations.

The text concludes with a thorough review lesson of all of the concepts taught in the other lessons.

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SKU: 48742338857

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4.8 ★★★★★
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Verified Purchase
Jennifer S
San Leandro, US
★★★★★ 5
Beautiful, functional, easy on hands, push button
Color: Stainless Steel
Update: these are great! I only charged them the day they arrived 3 months ago from Amazon, and have not had to charge them yet. They work efficiently every time my whole family loves using them,,especially the grandkids. I specifically wanted "push button" , and easy-rechargeable. I have arthritis so it's pretty amazing and wonderful. These rechargeable grinders are lightweight when they arrive, and easy to fill from the top. For each grinder, you will need to turn the top opening slightly to the left to release it, and then pull it open. My 9yo grandson had to show me. The salt and pepper grindersmake a relatively, low grinding sound, and have a small, shining,light at the bottom where the salt and pepper come out onto the food. The performance is good, the salt and pepper output seems not too much and not too little. Charging these grinders was extremely easy, and the little charging unit stand is provided with a C charger which you can connect into the back of the charging unit, and a USB connection on the other end for the wall .
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Reviewed in the United States on October 19, 2025
J
Verified Purchase
Joseph Ballew
Massapequa, US
★★★★★ 4
Best grinders I have ever used
Color: Stainless Steel
I bought these 6 months ago and they are great. They have stopped charging several times. The problem is the salt gets on the contacts and oxidized the contacts and the unit stops charging. You take sand paper and clean the contacts and they work fine again. I feel if the material on the charging port is made with stainless steel and the contacts on the grinders themselves are larger, I would have given this a 5 star. Even As it stands, I would purchase these again. I have several bad experiences buying manual grinders that last about a month and break. These are High Quality, but need to upgrade the contacts.
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Reviewed in the United States on January 12, 2026
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Verified Purchase
Katelyn Gohlke
Waukegan, US
★★★★★ 5
Salt n peppa
Color: Stainless Steel
Not sure why I waited so long to purchase these! They are great, nice sleek design and they make cooking so much easier! They work so well and I literally just hold it over whatever I’m cooking, press a button and fresh pepper and salt are grinding right before my eyes! In the past my shakers have left salt or pepper on the counter but so far these have not, which is a bonus for sure!
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Reviewed in the United States on January 28, 2026
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Verified Purchase
Shopaholic
Battle Creek, US
★★★★★ 5
Convenient and sleek
Color: Stainless Steel
These are very easy to use with one-hand operation. The adjustable grind settings work well, and the light feature is actually helpful when cooking. The stainless steel design looks modern on the counter. Grinding power is consistent and strong enough for everyday kitchen use. Pros: • Easy to operate • Adjustable grind size • Attractive design Cons: • Requires batteries • Slightly taller than manual grinders A convenient upgrade from manual mills.
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Reviewed in the United States on February 27, 2026
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Verified Purchase
Frank G.
Charlottesville, US
★★★★★ 5
Works Great and recharges
Color: Stainless Steel
Great item. My wife started having trouble with our hand cranked grinders and these two solved the problem.
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Reviewed in the United States on May 22, 2026

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