Measurement
I can estimate how long or heavy an object is, or what amount it holds, using everyday things as a guide, then measure or weigh it using appropriate instruments and units.
MNU 1-11a

To compare the mass of two objects – https://classroom.thenational.academy/lessons/to-compare-the-mass-of-two-objects-68ukgc

To compare the mass of more than two objects – https://classroom.thenational.academy/lessons/to-compare-the-mass-of-more-than-two-objects-65hp6r

To compare masses using non-standard units – https://classroom.thenational.academy/lessons/to-compare-masses-using-non-standard-units-crwker

To find the mass of objects in units – https://classroom.thenational.academy/lessons/to-find-the-mass-of-objects-in-units-6mukae

To experience standard units of mass – https://classroom.thenational.academy/lessons/to-experience-standard-units-of-mass-70upcd