Each glass has 3 ice cubes.

Number ofglassesNumber ofice cubes
13
26
3?
  • 9
  • 15
  • 18
  • 3

Count by threes. Use the chart:

Number ofglassesNumber ofice cubes
13
26
39

There are 9 ice cubes in 3 glasses.

Each tool box has 5 pairs of scissors.

Number oftool boxesNumber ofpairs of scissors
15
210
315
420
525
6?
  • 14
  • 20
  • 30
  • 25

Count by fives. Use the chart:

Number oftool boxesNumber ofpairs of scissors
15
210
315
420
525
630

There are 30 pairs of scissors in 6 tool boxes.

Each closet has 4 umbrellas.

Number ofclosetsNumber ofumbrellas
14
28
312
416
5?
  • 33
  • 24
  • 20
  • 29

Count by fours. Use the chart:

Number ofclosetsNumber ofumbrellas
14
28
312
416
520

There are 20 umbrellas in 5 closets.