Learn // Topics

All topics

Search by name, or narrow by subject, age, and type. Open a topic to see the ages it covers, what to learn first, and where it leads.

1 to 24 of 214 topics

By subject and area, youngest first

  • Mathematics // Addition & Subtraction

    Number bonds to 9

    Find the number that makes 10 when added to a given number from 1 to 9 (number bonds to 10)

    Ages 4 to 6Method
  • Mathematics // Addition & Subtraction

    Addition and subtraction word problems

    Solve addition and subtraction word problems within 10 using objects or drawings

    Ages 4 to 6Method
  • Mathematics // Addition & Subtraction

    Fluent adding and subtracting within 5

    Fluently add and subtract within 5

    Ages 5 to 6Method
  • Mathematics // Addition & Subtraction

    Number bonds

    Recall number bonds (addition and related subtraction facts) within 20

    Ages 5 to 6Method
  • Mathematics // Addition & Subtraction

    Adding and subtracting

    Add and subtract one-digit and two-digit numbers to 20, including zero

    Ages 5 to 6Method
  • Mathematics // Addition & Subtraction

    Early Word Problems

    Solve one-step word problems involving addition and subtraction to 20, including missing-number problems

    Ages 5 to 7Method
  • Mathematics // Addition & Subtraction

    Addition and subtraction within 20

    Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Fluent adding and subtracting within 10

    Fluently add and subtract within 10

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Adding within 100

    Add within 100 using strategies based on place value, including adding a two-digit and one-digit number, and a two-digit and a multiple of 10

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Mental and written addition and subtraction

    Solve addition and subtraction problems using mental and written methods, including problems involving numbers, quantities, and measures

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Adding two two-digit numbers

    Add and subtract two two-digit numbers using concrete objects, pictorial representations, and mental methods

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Mental addition and subtraction (age 6+)

    Add and subtract a two-digit number and ones mentally and using concrete/pictorial representations

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Unknown in Addition & Subtraction

    Determine the unknown whole number in an addition or subtraction equation relating three whole numbers

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Fluent addition and subtraction

    Recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Adding and subtracting tens mentally

    Add and subtract a two-digit number and tens mentally and using concrete/pictorial representations

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Subtracting multiples of 10

    Subtract multiples of 10 (10–90) from multiples of 10 using place value strategies

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Adding Three Small Numbers

    Add three one-digit numbers using strategies including looking for pairs that make 10

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Addition and subtraction strategies

    Use counting on and counting back as strategies for addition and subtraction

    Ages 6 to 7Method
  • Mathematics // Addition & Subtraction

    Fluent adding and subtracting within 100

    Fluently add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction

    Ages 7 to 8Method
  • Mathematics // Addition & Subtraction

    Fluent adding and subtracting within 20

    Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers

    Ages 7 to 8Method
  • Mathematics // Addition & Subtraction

    Addition and subtraction within 1000

    Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds

    Ages 7 to 8Method
  • Mathematics // Addition & Subtraction

    Adding and subtracting (age 7+)

    Add and subtract numbers with up to three digits using formal written methods of columnar addition and subtraction

    Ages 7 to 8Method
  • Mathematics // Addition & Subtraction

    Missing number problems (age 7+)

    Solve addition and subtraction problems including missing-number problems, using number facts, place value, and more complex methods

    Ages 7 to 8Method
  • Mathematics // Addition & Subtraction

    Two-Step Word Problems

    Solve one- and two-step word problems within 100 using addition and subtraction, with unknowns in all positions

    Ages 7 to 8Method