Lesson 4: Different equations can describe the situation because the equation doesn't have to be the same equation. you can have 21 - 11 and get 10, but have 2 + 8 and get 10.
Lesson 1: A tape diagram is used to represent a situation by having numbers on each lets say stamp you could have 20 as a product and have 4 stamps with 5 on each of them.
I don't know how to make a tape diagram on a computer.
Lesson 2; What it means that an equation is either true or false is if you get the correct answer to the equation.
Lesson 5: A fraction is made out of fractions or decimals because there is always an equal fraction. and you can represent a fraction like 10/10 as 1.00 as a decimal or 1/10 as 0.1
Lesson 3: A balance hanger will give you steps to find an unknown amount in an associated equation if the left side of the hanger has 5 squares on it and the number of 15 you would know that each square is equal to 3. and a true equation would tell you what you would add or multiply or divide or subtract.
