By the end of grade one, students understand and use the concept of ones and tens in the place value number system.
Students add and subtract small numbers with ease.
They measure with simple units and locate objects in space. They describe data and analyze and solve simple problems. 1.5 Identify and know the value of coins and show different combinations of coins that equal the same value. Use the inverse relationship between addition and subtraction to solve problems. 2.4 Count by 2s, 5s, and 10s to 100.