Track what arrives and leaves
Find the start, change or result in stories within 100.
6 practice questions Let’s explore →Grade 2 maths.
Discover the idea, experiment with a picture, then try it yourself. 63 authored lessons available.
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 →Does that plan fit?
Explain why an equation or a solution matches the story.
6 practice questions Let’s explore →A partner for every counter?
Discover odd and even numbers by pairing objects.
8 practice questions Let’s explore →One pair, two equal groups
Express an even number as the sum of two equal addends.
6 practice questions Let’s explore →Rows that help us count
Find totals in rectangular arrays with up to five rows and five columns.
8 practice questions Let’s explore →Give each row an addend
Write and explain equal-addend equations for arrays.
8 practice questions Let’s explore →A fact you know can help
Add within twenty using zero, one, doubles and tens.
10 practice questions Let’s explore →Use addition to subtract
Subtract within twenty by finding a missing part or crossing ten.
10 practice questions Let’s explore →Known facts: 0 and 1
Build reliable recall for sums starting with 0 or 1.
20 practice questions Let’s explore →Known facts: 2 and 3
Build reliable recall for sums starting with 2 or 3.
20 practice questions Let’s explore →Known facts: 4 and 5
Build reliable recall for sums starting with 4 or 5.
20 practice questions Let’s explore →Known facts: 6 and 7
Build reliable recall for sums starting with 6 or 7.
20 practice questions Let’s explore →Known facts: 8 and 9
Build reliable recall for sums starting with 8 or 9.
20 practice questions Let’s explore →Ten tens become a hundred
Build a hundred without adding or removing any ones.
6 practice questions Let’s explore →Every digit has a place
Read three-digit amounts, including empty tens and ones places.
8 practice questions Let’s explore →A trail to one thousand
Count by ones, fives, tens and hundreds from different starting numbers.
12 practice questions Let’s explore →Digits and words, same number
Read and write numbers to one thousand in numerals and words.
8 practice questions Let’s explore →Let each digit show its value
Write expanded form, including zero places and one thousand.
8 practice questions Let’s explore →Hundreds lead the comparison
Compare three-digit numbers using >, = and <.
8 practice questions Let’s explore →Hundreds with empty places
Connect every whole hundred from 100 to 900 with its hundreds and zero extra tens and ones.
15 practice questions Let’s explore →Join the units, find the total
Add within one hundred using tens and ones.
8 practice questions Let’s explore →Exchange a ten, keep its value
Subtract within one hundred, including when ones need regrouping.
8 practice questions Let’s explore →Tens can become a hundred
Add within one thousand, sometimes composing both tens and hundreds.
8 practice questions Let’s explore →Across an empty place
Subtract within one thousand and explain exchanges across zero places.
8 practice questions Let’s explore →Bring every group along
Add two, three or four two-digit numbers without losing a part.
6 practice questions Let’s explore →Change one whole unit
Mentally add or subtract ten or one hundred from numbers 100–900.
8 practice questions Let’s explore →Different grouping, same amount?
Explain why valid place-unit exchanges preserve addition and subtraction.
8 practice questions Let’s explore →Five-minute detectives
Follow the minute hand around the clock and write the time.
12 practice questions Let’s explore →Make a moment
Turn a written time into moving clock hands.
6 practice questions Let’s explore →One clock, a whole day
Use the story as well as the clock to choose a.m. or p.m.
12 practice questions Let’s explore →Small coins, different values
Count the values of pennies, nickels, dimes and quarters.
8 practice questions Let’s explore →Read the bill, count its value
Use dollar bills and the dollar symbol to find totals.
8 practice questions Let’s explore →More than one way to pay
Choose a set of coins or bills with exactly the requested value.
8 practice questions Let’s explore →A little shop, a maths story
Find a cost, change, or missing amount by following a money story.
8 practice questions Let’s explore →Does that money idea work?
Explain why a money comparison, symbol or exchange makes sense.
6 practice questions Let’s explore →Between two ruler marks
Read length as the distance between a strip's two ends.
8 practice questions Let’s explore →Move the ruler, keep the strip
Line up zero and make a measurement without moving the object.
6 practice questions Let’s explore →Choose a tool for the job
Choose and use rulers, yardsticks, meter sticks and measuring tapes.
6 practice questions Let’s explore →Same strip, different units
Measure the same length with larger and smaller units, and explain the different counts.
6 practice questions Let’s explore →A good guess has a reason
Estimate lengths in centimeters, meters, inches and feet using a reference.
8 practice questions Let’s explore →Find the extra length
Measure two objects and describe how much longer one is.
8 practice questions Let’s explore →Follow a length story
Join, cut and compare lengths, including a missing starting amount.
8 practice questions Let’s explore →A number is a distance from zero
Represent whole numbers and addition or subtraction with equally spaced points.
8 practice questions Let’s explore →Measure it. Record it. Plot it.
Measure several strips to the nearest whole unit and plot each result.
6 practice questions Let’s explore →One measurement, one mark
Turn recorded lengths into a whole-unit line plot.
6 practice questions Let’s explore →What do the marks tell us?
Distinguish recorded lengths from the number of measurements.
8 practice questions Let’s explore →Pictures that count
Build a picture graph with a single-unit scale and up to four categories.
6 practice questions Let’s explore →Build a bar for every category
Build a bar graph with a single-unit scale and up to four categories.
6 practice questions Let’s explore →Find the story in a graph
Use bar graphs to combine, separate and compare category counts.
8 practice questions Let’s explore →Sides and angles tell the story
Recognize triangles, quadrilaterals, pentagons and hexagons in varied forms.
10 practice questions Let’s explore →Build a shape from its clues
Draw guided polygons and a cube with their defining attributes.
8 practice questions Let’s explore →A cube has more than we can see
Explore all six faces and distinguish a cube from an elongated box.
8 practice questions Let’s explore →Every square belongs
Count a tiled rectangle by rows or columns, including an unfinished grid.
8 practice questions Let’s explore →Make the rows and columns
Partition a fixed rectangle into the requested rows and columns of squares.
6 practice questions Let’s explore →A third is a fair share
Name equal shares and explain how they make one whole.
10 practice questions Let’s explore →Make every share fair
Move the cuts while the whole stays fixed; give every share equal area.
6 practice questions Let’s explore →Different shapes. Same share.
Compare areas of differently shaped shares of identical wholes.
8 practice questions Let’s explore →Your own share of the mosaic
Shade a half, third or fourth in more than one way.
6 practice questions Let’s explore →