What is an algebraic expression? Whiteboard exercise Play

What is an irrational number? Student activity Play

What is on the graph? Whiteboard exercise Play

What is on the graph? Student activity Play

What number is that? Student activity Play

What percentage of one number is another number? Whiteboard exercise Play

What percentage of one number is another number? Whiteboard exercise Play

What percentage of one number is another number? Student activity Play

What should Lena choose? Whiteboard exercise Play

What should Lena choose? Student activity Play

When is a number divisible by 2, 4, 5, 10? Animation Play

When is a theorem false? Animation Play

When is a theorem false? The counterexample Student activity Play

When is an assignment a function? Student activity Play

Which is bigger? Whiteboard exercise Play

Which is bigger? Student activity Play

Which is more probable? Student activity Play

Why are negative numbers necessary? Student activity Play

Women's handwriting and men's handwriting Whiteboard exercise Play

Women's handwriting and men's handwriting Student activity Play

Working with decimal notation Student activity Play

Working with mixed numbers Animation Play

Working with mixed numbers Student activity Play

Write the sum using powers of 10 Student activity Play

Write the sum. Place value Whiteboard exercise Play