Which one doesn’t belong?

1. $5+2+2+2+2+2+2$
2. $5+6·2$
3. $5·2^6$
4. $5·2·2·2·2·2·2$

Compare your answers:

Your answer may vary, but here are some samples.

A doesn’t belong because:

• It is the only expression with repeated addition.
• It is the only expression that only has addition.

B doesn’t belong because:

• It is the only expression with both addition and multiplication.

C doesn’t belong because:

• It is the only expression with an exponent.

D doesn’t belong because:

• It is the only expression with repeated multiplication.
• It is the only expression that only has multiplication.