1. Mai says the numbers 10, 20, 30.
   What is Mai counting by?

2. What is the next number Mai will say?

How many are in each picture?

Which expression shows the number of dots?

Find the number that makes each equation true.

1. \(10 + 7 = \boxed{\phantom{\frac{aaai}{aaai}}}\)
2. \(10 + \boxed{\phantom{\frac{aaai}{aaai}}} = 15\)
3. \(\boxed{\phantom{\frac{aaai}{aaai}}} + 3 = 13\)

How many connecting cubes are in each picture?

How many connecting cubes are in the picture?

Which shows 10 more? Circle it.
Which shows 10 fewer? Cross it out.

1. Add 30:

   

2. 70 take away 2 tens is __________.

3. \(50 + 20 = \boxed{\phantom{70}}\)
   
   

4. \(80 - 50 = \boxed{\phantom{30}}\)

You can use towers of 10 cubes to help you with these questions.

1. Noah has 70 cubes in towers of 10.
   He gave some towers to Clare.
   Then he gave some towers to Andre.
   Now Noah has no cubes left.
   Describe 1 way this could happen.
   Show your thinking using drawings, numbers, or words.
   Write equations to represent the problem.

2. Describe another way this could happen.
   Show your thinking using drawings, numbers, or words.
   Write equations to represent the problem.

3. Diego has 10 cubes in a tower.
   Elena gave him some more towers.
   Then Mai gave him some more towers.
   Now Diego has 60 cubes in towers of 10.
   Describe 1 way this could happen.
   Show your thinking using drawings, numbers, or words.
   Write equations to represent the problem.

4. Describe another way this could happen.
   Show your thinking using drawings, numbers, or words.
   Write equations to represent the problem.