A boy looks closely at the face of a scale. A large blue block is in the scale tray.
2 girls look closely at the face of a scale. A large blue and yellow string of beads is in the scale tray.
2 boys look closely at the face of a scale. 3 glue sticks are in the scale tray.

"Mass is measured in grams (g) and kilograms (kg).  You measure it on a scale. "

"Mass is how heavy something is."

"In Maths today, we had to predict the mass of objects.  Then we got a scale and we measured how much different objects weighed."