1. Arithmetic in everyday life

A digit’s position determines whether it represents ones, tens, hundreds, or far more. This compact place-value system lets arithmetic handle everything from grocery prices to populations without needing a new symbol for every quantity.

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Use what you learned in the previous lesson to solve real-world problems.

Fractions describe parts, division, and comparisons. They help divide food fairly, adjust recipes, read measurements, compare prices, and reason about rates such as miles per hour.

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Use what you learned in the previous lesson to solve real-world problems.

Exact answers are not always necessary—or trustworthy. Rounding and mental estimates can predict a reasonable result, reveal calculator mistakes, and help people make quick decisions about time, cost, distance, and quantity.

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Use what you learned in the previous lesson to solve real-world problems.

Cashiers calculate change, nurses check doses, carpenters measure materials, cooks scale recipes, and programmers build numerical rules. Arithmetic also supports budgeting, sports statistics, scientific measurements, community planning, and countless personal projects.

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Use what you learned in the previous lesson to solve real-world problems.

Review this chapter with practice based on your mistakes.