Converting metric units involving decimal values up to two decimal places (e.g., 2.75 m to cm, 1.25 kg to g).
Where your child meets this in real life: Calculating exact measurements for recipes or DIY projects
SEAGReady breaks convert units with decimals into 3 steps, taught in order so each skill builds on the last.
Convert decimal measurements to smaller units by multiplying by 100 (e.g., 1.5 m to cm, 2.3 m to cm)
Convert decimal measurements using multiplication by 1000 (e.g., 2.5 kg to g, 1.25 L to ml, 1.5 km to m)
Convert decimal measurements to larger units using division (e.g., 250 cm to m, 1500 g to kg, 500 ml to L)
Three free sample questions from our convert units with decimals course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Sean has a piece of ribbon that is 2.5 metres long. How many centimetres long is the ribbon?
Answer: A. 250 cm
To convert metres to centimetres, multiply by 100. 2.5 m × 100 = 250 cm Move the decimal point 2 places to the right: 2.5 → 25.0 → 250 The ribbon is 250 cm long.
Stuck? Start here: How many centimetres are in 1 metre?
Niamh is baking a cake. Her recipe needs 2.5 kg of flour. How many grams of flour does she need?
Answer: B. 2500 g
To convert kilograms to grams, multiply by 1000. 2.5 kg × 1000 = 2500 g Move the decimal point 3 places to the right: 2.5 → 25.0 → 250.0 → 2500 Niamh needs 2500 g of flour.
Stuck? Start here: How many grams are in 1 kilogram?
A bookshelf is 150 cm tall. What is this height in metres?
Answer: A. 1.5 m
To convert centimetres to metres, divide by 100. 150 cm ÷ 100 = 1.5 m Move the decimal point 2 places to the left: 150 → 15.0 → 1.50 = 1.5 The bookshelf is 1.5 m tall.
Stuck? Start here: How many centimetres are in 1 metre?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Aoife is measuring fabric for a school project. She has a piece that is 1.5 metres long.
How many centimetres long is the fabric?
1.5 m = ? cm
Step 1 of 4
Aoife is measuring fabric for a school project. She has a piece that is 1.5 metres long.
How many centimetres long is the fabric?
The fabric is 150 cm long.
The key insight: Multiplying by 100 shifts every digit two places left - the decimal moves right!
Watch out: 1.5 m = 15 cm. Only moving the decimal one place gives 15, but you need two places for × 100.
These are the misconceptions we see most often in convert units with decimals, including the ones our practice questions are specifically designed to catch.
Struggling with convert units with decimals? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.