Calculations with rational numbers (negative fractions & decimals) — 7th grade math

I go through two more calculations that involve several operations and both negative and positive fractions and decimals. We also estimate the final answer before calculating.

The first example is 7/8 · (−2.1) + 2.47 and the second is (2/5 + 9/8)(−2.3). The first step is to choose whether to use fractions or decimals for the calculation. In the first example, I use decimals, and in the second, fractions.

See also

Multiply and Divide Rational Numbers 1 — video lesson

Math Mammoth Rational Numbers — a short workbook where you can find worksheets to match this lesson.

Math Mammoth Grade 7 curriculum (pre-algebra)

Back to pre-algebra videos index

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