Practice Addition and Subtraction.
In the following exercise, you are going to to practice on finding the sum and difference of decimal numbers. Follow the instructions below.
Add by Creating Base-ten Blocks.
The applet below has tools that create each of the base-ten blocks. You need to decide the value of each block before you begin. Read and follow the instructions below to learn how to create blocks.
(1.) 0.11 + 0.005
(2.) 0.209 + 0.01
(3.) 10.2 + 1.1456
(4.) 0.2 + 0.05
Subtract by Creating Base Ten Blocks.
In the previous activity, you learnt how to create blocks using the base-ten block applet. below are a set of questions for you to subtract using base-ten blocks.
(a.) 0.3 – 0.05
(b.) 2.1 – 0.4
(c.) 1.03 – 0.06
(d.) 0.02 – 0.007
Answer True or False. Explain your reasoning in each case.
Andre and Jada drew base-ten diagrams to represent . Andre drew 11 small rectangles. Jada drew only two figures: a square and a small rectangle.
(1.) If both students represented the sum correctly, what value does each small rectangle represent?
(2.) What value does each square represent?
(3.) Describe a diagram that could represent the sum . OR draw it in the applet below.