Early Math
Every lesson explains the concept, works through examples, and gives you practice problems with full solutions. Work through them in order, or jump to the topic you need.
32 lessons
- Counting to 100 by Ones and by TensKindergarten counting: say the numbers to 100 by ones and by tens, count on from any number, and write the numbers from 0 to 20, with pictures and practice.
- How Many? Counting Objects One by OneKindergarten counting: touch each object once, why the last number said tells how many, how each next number is one more, and counting things in rows and lines.
- More, Less and the SameKindergarten comparing: decide which group has more, fewer or the same number by matching or counting, and compare two numbers from 1 to 10.
- Adding and Taking Away Within 10Kindergarten addition and subtraction: put groups together and take some away with objects and drawings, solve story problems within 10, and know the facts within 5.
- Making Ten and Breaking Numbers ApartKindergarten number sense: break numbers up to 10 into two parts in more than one way, and find the number that makes 10 with any number from 1 to 9.
- Teen Numbers: Ten and Some MoreKindergarten place value: see the numbers 11 to 19 as ten ones and some more ones, with ten-frames, drawings and number sentences like 14 = 10 + 4.
- Comparing Objects: Longer, Taller, HeavierKindergarten measurement: describe what can be measured about an object, like length, height and weight, and compare two objects to see which has more.
- Shapes Around Us: Flat and SolidKindergarten geometry: name flat shapes of any size or turn, tell them from solid shapes like cubes and spheres, and use position words like above and next to.
- Building Shapes: Sides, Corners and Putting Shapes TogetherCount the sides and corners of flat shapes, compare flat and solid shapes, build shapes with sticks and clay, and put small shapes together to make bigger ones.
- Addition and Subtraction Stories Within 20First grade word problems: add to, take from, put together, take apart and compare within 20, with the unknown in any spot, plus stories that add three numbers.
- Addition and Subtraction Strategies Within 20Add and subtract within 20 in your head: count on, turn a sum around, make a ten, use doubles, subtract through ten, and use a fact you know. Grades 1–2.
- Sorting and Counting: Groups and GraphsSort objects into groups, count each group and put the groups in order, then read simple graphs to find the total and how many more or fewer. Grades K–1.
- Subtraction and Missing NumbersFirst grade: subtract by finding a missing part, such as 10 − 8 as 8 + ? = 10, and find the missing number in any addition or subtraction sentence.
- The Equal Sign: True and False Number SentencesFirst grade: the equal sign means 'is the same as.' Check whether number sentences like 7 = 8 − 1 and 4 + 1 = 5 + 2 are true or false, and fill in missing numbers.
- Counting to 120First grade counting: count to 120 from any number, read and write the numbers past 100, and count a big group of objects by tens and ones.
- Tens and Ones: Place Value to 99First grade place value: see a ten as ten ones, read a two-digit number as tens and ones, and compare two-digit numbers with the symbols >, = and <.
- Adding Tens and Ones Within 100First grade: find 10 more or 10 less in your head, add and subtract tens, and add within 100 by adding tens to tens and ones to ones, making a new ten when needed.
- Measuring Length with UnitsFirst grade measurement: put three objects in order by length, compare two lengths using a third object, and measure with same-size units laid end to end.
- Telling Time: Hours, Half Hours and MinutesTell and write time on analog and digital clocks: to the hour and half hour in first grade, to five minutes with a.m. and p.m. in second grade.
- What Makes a Shape: Sides, Angles and FacesTell what names a shape, like being closed with three sides, from what does not, like color and size; then name quadrilaterals, pentagons, hexagons and cubes.
- Equal Shares: Halves, Thirds and FourthsCut circles and rectangles into two, three or four equal shares, name them halves, thirds and fourths, and see why more shares means smaller shares. Grades 1–2.
- Word Problems Within 100: One and Two StepsSecond grade word problems: add and subtract within 100 to solve one-step and two-step problems, using tape diagrams and number sentences with a box for the unknown.
- Odd and Even NumbersSecond grade: tell whether a group of up to 20 objects is odd or even by pairing them or counting by 2s, and write an even number as a double, like 12 = 6 + 6.
- Arrays: Rows, Columns and Equal GroupsGrade 2: find the total in an array by adding equal rows or columns, write it as a sum like 4 + 4 + 4, and count the squares in a rectangle cut into rows and columns.
- Hundreds, Tens and Ones: Place Value to 1,000Second grade place value: see a hundred as ten tens, read three-digit numbers as hundreds, tens and ones, write them in words and expanded form, and compare them.
- Counting and Skip-Counting to 1,000Second grade: count to 1,000, skip-count by 5s, 10s and 100s from any number, and add or subtract 10 or 100 in your head.
- Adding and Subtracting Within 100Grade 2: add and subtract within 100 with place value — tens with tens and ones with ones, making a ten, counting up — add up to four numbers, and explain why it works.
- Adding and Subtracting Within 1,000Grade 2: add and subtract three-digit numbers — hundreds with hundreds, tens with tens, ones with ones — making or breaking tens and hundreds, and write it in columns.
- Measuring in Inches, Feet, Centimeters and MetersSecond grade measurement: measure with rulers and meter sticks, estimate lengths, see why bigger units give smaller numbers, and find how much longer one thing is.
- Length Problems and the Number LineSecond grade: show numbers as lengths from 0 on a number line, add and subtract with jumps, and solve word problems about lengths in the same unit.
- Counting Money: Coins, Dollars and CentsGrade 2 money: know pennies, nickels, dimes, quarters and dollar bills, count mixed coins by skip-counting, use the ¢ and dollar signs, and solve money word problems.
- Picture Graphs, Bar Graphs and Line PlotsSecond grade data: measure objects and show the lengths on a line plot, draw picture graphs and bar graphs with up to four groups, and answer questions from them.