Curriculum placement
Kindergarten. This describes the skill, not a learner estimate.
Comparing two groups by matching
Compare two groups by pairing their objects
Problem types
- Find the group with more, fewer or the same
- Compare two groups
Builds on
- Counting objects to 20
- Sorting and counting · Useful idea
After sorting, the counts of two piles are compared to see which has more.
- Subtracting within 10 · Useful idea
How many more one group has is found by taking the smaller count away from the larger: 7 is 3 more than 4 because 7 - 4 = 3.
Leads to
- Ordering numbers through 10 · Extend the idea
Pairing objects shows which group has more. The same comparison is recorded by which numeral is greater.
- Reading a categorical graph · See it applied
Deciding which category has more or fewer uses the same group comparison, applied to counts in a picture graph.
- Picture graphs and bar graphs · See it applied
Comparing two bars is comparing two groups: the taller bar stands for the group with more.
- Additive and multiplicative comparison · Extend the idea
Comparing groups as more or fewer extends to comparing as times as many.
Related skills
- Halves and quarters of a whole · Related idea
Two shares are equal when neither group has more, which is the check for halves and quarters.
- Line plots of lengths · Related idea
Comparing the number of dots stacked at two values on a line plot is the same group comparison, with each stack standing for a group.
- Adding within 10 · Shared foundations
- Counting by ones and by tens · Shared foundations
- Odd and even numbers · Shared foundations
Open the interactive map to explore lessons and skill connections.