# M1.3.11

**Writes a number sentence**to represent a problem situation.

### Grandpa's Social Security

This simple example shows how algebra can be useful in the real world: Should Grandpa start receiving his Social Security Benefits at age 62 or should he wait until age 65?

### Geometric Addition + Logarithms = Geometric Multiplication

Mathematicians often argue that anything which can be represented numerically or algebraically can also be represented geometrically. This is perhaps true even to the

extent that simple numeric calculations can be demonstrated geometrically. The following example illustrates one such geometric process of addition.