Mostly Postie is a mobile-friendly scale reading
Y1:To begin to measure mass / weight.
Y2:To choose and use appropriate standard units to estimate and measure length/height in any direction (m/cm); mass (kg/g)
temperature (°C); capacity (litres/ml) to the nearest appropriate unit, using rulers, scales, thermometers and measuring vessels.
Y3:To measure, compare, add and subtract: lengths (m/cm/mm); mass (kg/g); volume/capacity (l/ml).
Drag the parcel onto the scales.
Read the scales to find the mass of the object.
Type the mass on the keypad.
Press 'check' - if you're correct the post van will deliver your post.
Make it trickier, you can enter half kg as ½kg or 500g.