How many were there? A more difficult problem Student activity Play

How many? Student activity Play

How much do they weigh together? Student activity Play

How much do they weigh together? Whiteboard exercise Play

How much does it weigh? Student activity Play

How much does the part of a fruit weigh? Simulation Play

How much more could it contain? How much less? Whiteboard exercise Play

How much more could it contain? How much less? Whiteboard exercise Play

How much more could it contain? How much less? Student activity Play

How much time? Student activity Play

How much? Whiteboard exercise Play

How much? Whiteboard exercise Play

How to divide Student activity Play

How to multiply a sum by a monomial Student activity Play

Implantation Student activity Play

Interesting fact Animation Play

Interesting fact Animation Play

Interesting fact Animation Play

Interesting fact Animation Play

Interesting fact Animation Play

Interesting fact Animation Play

Interesting facts about the calendar Whiteboard exercise Play

Interesting facts about the calendar Student activity Play

Inverse operations Student activity Play

Lena's expenses Whiteboard exercise Play