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Objectives: Understand and use decimal place value. Multiply and divide by 10 and 100 and explain the effect. Vocabulary.

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Presentation on theme: "Objectives: Understand and use decimal place value. Multiply and divide by 10 and 100 and explain the effect. Vocabulary."— Presentation transcript:

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3 Objectives: Understand and use decimal place value. Multiply and divide by 10 and 100 and explain the effect. Vocabulary

4 Multiply this number by 10 What is your answer? What has happened to all of the digits? What happens when we multiply by 100? T U H T U 3 tens become 3 hundreds, 5 units become 5 tens Each digit in the number has moved one column to the left. (each digit in the number moves 2 columns to the left) Th H T U H

5 Multiply each of the following numbers by 10, as they appear. Multiply each of the following numbers by 100, as they appear

6 Divide this number by 10 What is your answer? Explain what has happened to each of the digits. What happens when we divide by 100? T U U. t The 4 tens become 4 units, the 6 units become 6 tenths. Each of the digits in the number has moved one column to the right. Each of the digits in the number moves two columns to the right. U. t h. t

7 Divide each of the following numbers by 10, as they appear. Divide each of the following numbers by 100, as they appear

8 T1.1B As the number is highlighted multiply or divide by powers of 10 as instructed.

9 X ? 3 x 1 = 3 3 x 1000= x 100 = x = x 10 = 30 3 x 0.1 = 0.3 Look carefully at this spider diagram before you move on.

10 Multiplication Spider Diagram W/S1.1B Using worksheet W/S 1.1B complete your own multiplication spider diagram. Choose your own number in the middle. Now check your answers using a calculator.

11 465 ÷ 10 ÷ 100 ÷ 1 ÷ Try to state the answer before it appears on the spider diagram.

12 W/S 1.2B Division Spider Diagram Start with a number of your choice in the middle and complete the division spider diagram. Now check your answers on a calculator before you move on.

13 T1.2B I divided by ten and my answer is 0.6 – what number did I start with? I multiplied by 100 and my answer is 40 – what number did I start with? Make up three questions like the ones above and try them out on someone else – explain your working to them if necessary.

14 Objectives: Understand and use decimal place value. Multiply and divide by 10 and 100 and explain the effect. Vocabulary

15 Thank you for your attention


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