Math Mammoth Add & Subtract 4

55 pages
(includes answers)

Sample pages (PDF)
Contents and Introduction
Subtract in Columns
Patterns and Mental Math
Bar Models in Addition and Subtraction
Line Graphs
Calculate and Estimate Money Amounts

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Este libro en español

Math Mammoth Add & Subtract 4 is a workbook for 4th grade, and it covers the following topics related to addition and subtraction:

• mental addition and subtraction strategies;
• adding and subtracting in columns;
• some numerical patterns;
• bar models in problem solving;
• order of operations;
• line graphs and bar graphs;
• rounding and estimating;
• money problems and discounts.

The lessons in this book are taken from the first chapter of Math Mammoth Grade 4 Complete Curriculum. Some of the lessons are even useful for 5th grade students, especially if they have not had much exposure to word problems, the order of operations, and applications of addition and subtraction.

At first, we review the "technical aspects" of adding and subtracting: mental math techniques and adding and subtracting in columns. We also study some patterns. The lesson on Pascal's triangle is intended to be fun and fascinating—after all, Pascal's triangle is full of patterns!

In the next lesson, we study the connection between addition and subtraction and bar models. Bar models help students write addition and subtraction sentences with unknowns, and solve them. This is teaching the students algebraic thinking: how to write and solve simple equations.

The lesson on the order of operations contains some review, but we also study connecting the topic with real-life situations (such as shopping). Here, the student writes the mathematical expression (number sentence) for word problems, which again, practices algebraic thinking.

Going towards applications of math, the book then contains straightforward lessons on bar graphs, line graphs, rounding, estimating, and money problems.

The PDF version of this book can be filled in on a computer, phone, or tablet, using the annotation tools found in many PDF apps. See more.