Number+and+Operations+in+Base+Ten

3.N.BT.1- Round to the nearest 10 or 100

3.N.BT.2- + or - within 1,00 (range of algorithms)

3.N.BT.3- multiply 1 digit by 10-90 (50 x 4= 4 groups of 5 tens or 20 tens = 200)