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Math Mammoth Add & Subtract 4

Math Mammoth Add & Subtract 4 covers the following addition and subtraction related topics which are approximately for the third and fourth grade level:

  • mental addition and subtraction strategies;
  • adding and subtracting in columns;
  • Roman numerals;
  • the connection between addition and subtraction, missing addend problems, and solving word problems with bar diagrams;
  • order of operations;
  • bar graphs, line graphs, and money problems.

The lessons in this book are taken from the first chapters of Math Mammoth Grade 3 and Grade 4 Complete Worktexts (LightBlue Series 3rd and 4th grade).

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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* Math Maker, for printable math activities with answer keys
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By purchasing any of the books, permission IS granted for the teacher (or parent) to reproduce this material to be used with his/her students in a teaching situation; not for commercial resale. However, you are not permitted to share the material with another teacher.

In other words, you are permitted to make copies for the students/children you are teaching, but not for other teachers' usage.

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