**Warmup**

**Activity #1**

** 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.

- Attempt the problems on paper before checking the answers.
- Check the Hint boxes to see the explanations.
- Click the white square box at the left bottom for a new problem.
- Practice with harder problems by moving the slider to the right. You might have to high light it and use the forward arrow key on your key board.

- Without actually performing the calculations below, match each addition to the numbers on the right.

**Activity #2**

**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.

- Select a Block tool, and then click on the screen to place it.
- Click on the Move tool (the arrow) when you are done choosing blocks.
- Subtract by deleting with the delete tool (the trash can), not by crossing out.

- Then, compute each sum below by drawing base-ten diagrams on the applet to help you.

(1.) 0.11 + 0.005

(2.) 0.209 + 0.01

(3.) 10.2 + 1.1456

(4.) 0.2 + 0.05

**Activity #3**

**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.

- Find each difference. If you get stuck, you can use the applet below to represent each expression and find its value.
- Explain how you got your answer in each case.

(a.) 0.3 – 0.05

(b.) 2.1 – 0.4

(c.) 1.03 – 0.06

(d.) 0.02 – 0.007

**Challenge #1**

Answer True or False. Explain your reasoning in each case.

**Challenge #2**

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.

- Draw a diagram using the applet below that could represent the sum .

**Challenge #3**

**Quiz Time**

https://www.ixl.com/math/grade-6/add-and-subtract-decimal-numbers

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