BIG news: online math practice at

This is a big announcement!

I have the pleasure to announce a NEW section on Math Mammoth website that focuses on ONLINE PRACTICE for various math concepts!

I am sure that many of you will get lots of use out of this new section.

The scripts there have been made by my son; let's just call him Codelover 😃.

He's still pretty young, but he loves coding and web development, and has been learning a lot about those topics right and left for a while now (mostly using courses from Udemy).

I do have a favor to ask though. He made this section in such a manner that it SHOULD work offline (it's something called "progressive web app"; I don't personally understand these concepts nearly as well as he does so I won't even try to explain it). It seems that sometimes it's necessary to RELOAD the page a few times to make it work offline.

He would appreciate it if you can test whether it indeed works offline also, or not, and then leave feedback on the site. Please list you…

Reviewing 1st grade addition & subtraction facts

A customer asked me about reviewing addition/subtraction facts from 1st grade. The child is currently in 2nd grade but those facts continue to be a weak point, despite flash cards, daily drills on paper, and online drills in the past.

Here's my answer...

Check out these videos, which show you how the addition facts are taught in MM grade 1.

Subtraction facts don't need memorized separately. If you know that 5 + 4 = 9, from that you also know that 9 - 4 = 5 and 9 - 5 = 4. So, subtraction facts become "missing number" addition problems.

For example, 7 - 3 = ?

Think: which addition fact is this one: 3 + ___ = 7?

You can most likely make worksheets for her based on those videos, but if you want an actual book, check out these:

Hope this helps!

Math Mammoth Blue series books - printed versions

A bit of news...

The printed versions for the  Math Mammoth Blue series books are now available in FULL COLOR. 😃 They're available through, as before, and printed on-demand.

To find these, first locate the books you're interested in the list of Blue series books at

Then, for each book, you will find a link to Lulu listed under the cover image of that book.

Check out also home page for coupon codes; they run promotions often!

Find the factors puzzles for practicing the multiplication tables

Here are neat puzzles to review factors in multiplication, the multiplication tables -- and consequently, the basic division facts -- all in the same "package"!

Or, just use them as cool logic puzzles. ☺

They're called Find the Factors puzzles.

This page explains how to solve them.

On this page you'll find a vast amount of them, as Excel spreadsheets:

Like the author says, "The more multiplication facts you know, the easier these puzzles become. Working on these puzzles can help you learn the multiplication table better."

Math Mammoth Grade 5 Skills Review Workbook

Grade 5 Skills Review Workbook is finally ready and available (as a PDF)!

This book has been designed to complement the lessons in Math Mammoth Grade 5 complete curriculum, providing spiral review of the concepts in the Grade 5 curriculum.

The book is divided into chapters, which correspond to the chapters in Math Mammoth Grade 5 curriculum. It is meant to be used during the school year, alongside the main curriculum. Spiral reviewing means that after a particular concept or skill has been studied in the main curriculum, it is then reviewed repeatedly over time in several different worksheets of this book.

Math Mammoth August sale is live!

You can now get 25% off of all of Math Mammoth and Make It Real Learning products sold at Math Mammoth website!

Use coupon code J9W2-YHDY-R2S2. 

The offer is valid till August 26, 2018.

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