Write numbers in these number sentences to make them true. 4 x 18 = 2 x ; 2 x 16 = 64 + ; 100 4 = 50 + ; 2 x = 36 Write your own balancing number sentence.

$$72 \div 2 = 36$$

The completed sentence is $4 \times 18 = 2 \times \boxed{\textbf{36}}$.

6. $2 \times 16 = 64 + \boxed{}$

$$32 - 64 = -32$$

The completed sentence is $2 \times 16 = 64 + \boxed{\textbf{-32}}$.

7. $100 \div 4 = 50 + \boxed{}$

$$25 - 50 = -25$$

The completed sentence is $100 \div 4 = 50 + \boxed{\textbf{-25}}$.

8. $2 \times \boxed{} = 36 \div 2$

$$18 \div 2 = 9$$

The completed sentence is $2 \times \boxed{\textbf{9}} = 36 \div 2$.

9. Write your own balancing number sentence.
Here is an example of a balancing number sentence:

$$\boxed{\textbf{10 + 5 = 3 \times 5}}$$