Lesson objective: Solve problems using the understanding that in numbers digits’ values represent \({1 \over 10}\) of what they represent in the place to the left.
This lesson provides an opportunity for students to apply their knowledge and understanding of the idea that the value of a digit in a given place is onetenth as much as the value of the digit to its left to a reallife situation. Students are asked to determine how many scoops of each kind of tea two girls have in their shopping bags given the total weight of each shopping bag and individual weight of each kind of tea scoops.
Key Concept students will use:

In numbers, digits represent \({1 \over 10}\) of what they represent in the place to the left.
Skills students will use:
 determining \({1 \over 10}\) of a given digit
Students engage in Mathematical Practice 7 (Look for and make use of structure) as they examine the order of the digits that stand for the total weight of each shopping bag and determine the difference in values of the given digits.
Key vocabulary:

decimal

digit

hundredths

tenths

value of a digit
Special materials needed:
 base ten blocks
 place value chart