Measuring, money and reading simple charts

Choosing a sensible unit

A pencil is measured in cm, a classroom in m, an apple in g, a person in kg, a spoonful in ml, a bottle in l. Picking the wrong unit gives silly answers like a $3$-metre pencil, and Checkpoint asks this on purpose.

Converting

$1$ m $=100$ cm and $1$ kg $=1000$ g. Going to a smaller unit the number gets bigger: $2$ m $=200$ cm. That sentence, said out loud, prevents most conversion errors.

Pictograms

In a pictogram each symbol stands for a number given in the key — often more than one. Half a symbol means half of that number. Always read the key before counting anything.