3rd Grade Math Centers

Weigh it Twice

Materials: balance scales, set of gram weights, paper clips, set of small objects

1. Work with a partner. Select five small classroom objects to weigh on
   the balance scales.


2. Measure each object twice, first using paper clips and then using
   grams (g).


3. Record your data in a three column table with the headings:
   Object, Non-Standard Unit (paper clips) and Standard Unit (g).


4. Record three comparative statements about your data.

The difference in weight between

the tissue box and the sharpener

was 16g.

The scissors weighed

5 grams less than the

stapler.

It took twice as many

paper clips to weigh the

eraser than the pencil.

The eraser and the

sharpener had an

equal weight of 12 g.

It took 18 more paper clips

to weigh the stapler than

the box of pencils.

Object Non-Standard Unit

(paper clips)

Standard Unit (g)