How to Teach Decimals — From Money to Place Value
Decimals are easier to teach than fractions if you start with money. Here's the sequence from £0.50 to hundredths and thousandths.
Decimals are easier to teach than most parents expect, because every child has already seen them — on price tags. £1.50 and $3.75 are decimal numbers, and a 7-year-old who knows that a fifty-pence piece is half a pound has already grasped the core concept of tenths without knowing the name.
Start there. Teach decimals as money first, then extend to measurement (centimetres and metres), and only introduce the place-value grid (tenths, hundredths, thousandths) once the child can confidently handle decimal money. That order puts the concept before the abstraction, which is how maths should always work at this age.
The biggest trap is treating decimals as a brand new topic disconnected from fractions. Every decimal is secretly a fraction: 0.5 is 1/2, 0.25 is 1/4. Make that link explicit from day one and the two topics reinforce each other instead of confusing each other.
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Frequently Asked Questions
What age are decimals taught?+
Year 4 to Year 5 in the UK (age 8 to 10). US fourth and fifth grades cover the equivalent content.
How do I explain decimals?+
Start with money. £1.50 means one pound and fifty pence. The fifty pence is the decimal part. Once that's clear, introduce tenths and hundredths as the place-value names for the digits after the dot.
Are decimals the same as fractions?+
Yes — different notation for the same concept. 0.5 = 1/2. 0.25 = 1/4. Teaching them together (showing the equivalence) is more effective than teaching them in separate units.
What comes after decimals?+
Percentages. They're the third way of writing the same thing — 0.5 = 1/2 = 50%. Once a child sees that all three are equivalent, the rest of the topic becomes translation.