There are 708 students in a school. There are 394 students in the cafeteria, and the rest are in class. Han estimates that 400 students are in class. Do you agree with Han’s estimate? Explain or show your reasoning.

Select all equations that match the diagram.

There are 240 connecting cubes in the box. Five students each take 9 connecting cubes from the box. How many connecting cubes are left in the box?

1. Write an equation to represent the situation. Use a letter for the unknown quantity.
2. Solve the problem. Explain or show your reasoning.

Andre had 245 cards. He buys 7 packages of cards.

1. What information do you need to know to find the number of cards Andre has now?
2. Write an expression to represent the number of cards Andre has now. Use a letter for the unknown quantity.

For each equation, draw a diagram and write a situation with a question.

1. \((3 \times n) + 163 = 187\)
2. \(b - (4 \times 10) = 89\)

1. A question in a subtraction situation can be answered with an estimate of “about 200.” What could be the subtraction situation?
2. A question in a situation that uses multiplication and addition could be answered with an estimate of “about 300.” What could be the situation?