My last column introduced the concepts underlying BCD (binary-coded-decimal) representations. In particular, we considered unsigned versus 10s-complement versions of BCD numbers. In this column we are ...

Use visual fraction models to add and subtract fractions with the same denominators. Use visual fraction models to add and subtract fractions with the same denominators. Notice patterns in the ...

Addition & subtraction with regrouping using different strategies to solve. In this lesson, students go over addition and subtraction with regrouping using different strategies to solve. Today we ...

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Calculate \(3.6 + 14.73\). Make sure that units line up with units, tenths line up with tenths and so on. Use zeros as placeholders if you need to.

To add and subtract numbers always begin counting from zero. When adding positive numbers, count to the right. When subtracting positive numbers, count to the left.