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Math Mammoth Add & Subtract 4 covers the following addition and subtraction related topics which are approximately for the third and fourth grade level:
The PDF version of this book is enabled for annotation. This means that if you prefer, your student can fill it in on the computer, using the typewriter and drawing tools in Adobe Reader version 9 or greater.
The lessons in this book are taken from the first chapters of Math Mammoth Grade 3 and Grade 4 Complete Curriculum (Light Blue Series). Some of the lessons are useful even for 5th grade students, especially if they have not had much exposure to word problems, order of operations, and applications of addition and subtraction.
The first lessons cover the "technical aspects" of adding, such as mental math strategies, terminology, and adding in columns. These are repeated for subtraction. Children also get to see how the sum or difference changes if the numbers in the problems change and how that can be used to solve problems mentally.
The addition and subtraction connection is already a familiar topic, but the first lesson on this topic practices this with bigger numbers. In the next lessons, the student solves word problems with the help of bar diagrams. Next, we solve simple missing addend equations using subtraction, such as x + 20 = 60. We use bar diagrams to illustrate these and connect them with fact families. These lessons help students think algebraically.
We also practice subtracting in columns and borrowing. The lessons illustrate this process with the help of pictures that relate to the three different place values.
Students are also introduced to parentheses and the order of operations including building the mathematical expression (calculation) needed for certain real-life situations. Students also get to practice their adding and subtracting skills when reading a mileage chart, bar graphs, line graphs, rounding, estimating, and money problems.
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