## Numbers and Operations- 2 Digit +/-

**Students are expected to:**

**Add within 100, including adding a two-digit number and a one-digit number, and adding a**

two-digit number and a multiple of 10.

two-digit number and a multiple of 10.

ex: 46+7= (2 digit by one digit) Ex: 46+30= (2 digit and multiple of ten)

**Given a two-digit number, mentally find 10 more or 10 less than the number, without having to**

count; explain the reasoning used.

count; explain the reasoning used

ex: 50+ 10= 70-10=

**Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90.**

ex: 84-50=