Every counter counts
Touch each counter once and use the last number as the total.
4 practice questions Let’s explore →Find your next discovery.
Every lesson starts with an idea you can understand. Choose a grade, read about a topic, or search inside the playground.
Kindergarten →
Count it. Build it.
Count sets in different arrangements and make a set yourself.
6 practice questions Let’s explore →A number for every set
Connect counters and written numbers from 0 to 20.
6 practice questions Let’s explore →One more makes the next
See why the next number means one more object.
5 practice questions Let’s explore →Which group has more?
Match two groups to compare their amounts.
5 practice questions Let’s explore →Compare two numbers
Tell whether one written number is greater, less, or equal.
5 practice questions Let’s explore →Grade 1 →
What changed in the story?
Find a starting amount, a change, or a result.
6 practice questions Let’s explore →The parts and the whole
Find the total or a missing part of one group.
5 practice questions Let’s explore →More, fewer, how many?
Compare two amounts and find the difference or a missing amount.
6 practice questions Let’s explore →Three groups, one total
Solve stories that join three groups, with totals up to twenty.
5 practice questions Let’s explore →Same groups, different order
Use a known addition fact in either order.
5 practice questions Let’s explore →Choose an easy pair
Group three addition parts in different ways.
5 practice questions Let’s explore →Grade 2 →
Track what arrives and leaves
Find the start, change or result in stories within 100.
6 practice questions Let’s explore →Find the missing part
Join groups, find missing parts and discover different ways to split a whole.
5 practice questions Let’s explore →Make sense of more and fewer
Find either amount or the difference, even when the wording reverses.
6 practice questions Let’s explore →One story, two changes
Follow two events and keep the middle amount connected.
6 practice questions Let’s explore →Work back through a story
Use the ending amount to find an earlier amount or a missing change.
6 practice questions Let’s explore →Put it together, then compare
Connect a part-whole relationship with a comparison or a change.
6 practice questions Let’s explore →Grade 3 →
Multiplication tells a group story
Connect groups, objects in each group and the total to a multiplication equation.
10 practice questions Let’s explore →How much does each group get?
Share a known total equally among a known number of groups.
8 practice questions Let’s explore →How many groups can we make?
Pack a known total into groups of a given size and count the groups.
8 practice questions Let’s explore →Patterns in the addition table
Read a table, follow a change and explain why sums behave that way.
16 practice questions Let’s explore →Patterns with a reason
Connect table patterns to arrays, equal groups and pairs.
16 practice questions Let’s explore →A familiar fact, a new unit
Use a one-digit fact to count tens, then explain the total in ones.
16 practice questions Let’s explore →Grade 4 →
What does “times” compare?
Read a multiplication equation as more than one numerical comparison.
8 practice questions Let’s explore →Give the story an equation
Keep the quantity labels while translating a comparison into an equation.
8 practice questions Let’s explore →Find the missing comparison
Identify the unknown, represent the relationship, and solve it.
9 practice questions Let’s explore →Three more or three times?
Compare adding extra objects with making equal groups.
8 practice questions Let’s explore →Solve the whole story
Work out what the story is asking, then find the missing amount.
8 practice questions Let’s explore →Follow the quantities
Keep meanings and units through two connected calculations.
6 practice questions Let’s explore →Grade 5 →
Keep a calculation together
See why a grouped amount stays together while you calculate.
13 practice questions Let’s explore →Write the calculation you mean
Build an expression that records the stated sequence of calculations.
8 practice questions Let’s explore →Read an expression without solving it
Describe copies or equal shares of a grouped amount without calculating its total.
8 practice questions Let’s explore →A digit gets its value from its place
Connect a digit's count and place unit to the amount it represents.
10 practice questions Let’s explore →Exchange pieces, keep the amount
Change the count of place units without changing the measured amount.
8 practice questions Let’s explore →Build a power of ten
Connect repeated tenfold copies to exponents and explain zero patterns.
10 practice questions Let’s explore →Looking for more topics?
The complete Common Core standards map is available in the playground, alongside starter activities for fractions, area, word problems, equations and linear relationships. Authored lessons are available from kindergarten through Grade 5; later grades currently have selected starter activities. Educational review is ongoing.
Open the curriculum map →