Multiplying Decimals Introduction The Triceratops Skeleton When the students in Mrs. Andersen’s class arrive at the Science Museum, Kara is very excited to learn that there is a dinosaur exhibit. In fact, it is a famous dinosaur exhibit. Kara can’t wait to get to see it. When Kara walks in, she is delighted. “Imagine, that dinosaur is about 4 and a half times as long as you are!” The students exit the exhibit hall, but Kara pauses at the door. Mrs. times as long as you are.” Kara knows that she is feet tall. times as long as she is, how long is the dinosaur? While Mrs. She writes down the following figures. If Kara multiplies these numbers correctly, she will be able to figure out how long the triceratops is. How long is he? In this lesson you will learn all about multiplying decimals. What You Will Learn In this lesson you will learn the following skills: Multiply decimals by decimals using area models (hundredths grid). Teaching Time I. Sometimes in life, you will need to multiply a decimal by another decimal.
Media - Decimal multiplication: petrol prices Overview Petrol for our cars is made from crude oil. The price of crude oil is constantly changing. This affects the price of petrol at the pump. Listen to Natasha Thiele explain how and why the price of petrol keeps changing. 3 mins 44 secs Source: Behind The News (BTN) | Learning area: Mathematics | Primary: Year 6 Transcript 00:00:00:00NATHAN BAZLEY:If your parents drive a car you've probably heard them talk about petrol prices, which are constantly changing. ...Read more > 00:00:20:13NATASHA THIELE:Buying fuel is one of the biggest costs for people who own a car. About this resource Acknowledgements Source: Behind The News (BTN) Date first broadcast: 15 March 2011 Cite this resource You can use this information to reference this item. Bibliographic details for 'What's the price of petrol?' Behind The News (BTN), ' What's the price of petrol?' abcspla.sh/m/29700 24 April 2014 Copyright information
Multiplying Decimals Lessons By using visual aids, and explaining mathematical language students can get a concrete grasp of how to multiply decimals. When teaching students how to multiply decimals, I focus on two instructional strategies - the first is to focus on language, in particular the use of the word "of", and second is the use of grids to visually represent a multiplication sentence. The word "of" is important to understand in this context because it is used when multiplying decimals with a grid. For example, 0.5 x 2 = 1, this can be understood as 0.5 or 1/2 of 2 is 1. Without attempting to actually solve the multiplication sentence, and relying on prior knowledge, most students should be able to understand this example. Grids are another excellent tool. Using a 10 x 10 grid, a review of decimals on a grid should take place first. You could use this sentence 0.3 x 0.4 = 0.12 as an example. Decimals: Hundredths This worksheet provides practice with decimals. Decimal Designs Grid Lock