Content Session # 7 & 8 July 9, 2009. Which problem can we use our whole number multiplication knowledge to solve? 1m of wire weighs 1.4 lb. How much.

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Presentation transcript:

Content Session # 7 & 8 July 9, 2009

Which problem can we use our whole number multiplication knowledge to solve? 1m of wire weighs 1.4 lb. How much will 6m of the same wire weigh? 1m of wire weighs 6 grams. How much will 1.4 m of the sa,e wore weigh?

Double Number Line

Unitary Perspective of Numbers We have 6 groups of grams. 14 x 6 = 84; Altogether, we have grams grams  8.4 grams 1.4 x 6 = 8.4

Which problem can we use our whole number division knowledge to solve? 4 m of iron pipe weighs 3.6 kg. How much will 1m of the same pipe weigh? 3.6 m of iron pipe weighs 9 kg. How much will 1m of the same pipe weigh?

Double Number Line

Unitary Perspective of Numbers Divide kg to make 4 equal groups. 36 ÷ 4 = 9; Each group will have kg kg = 0.9 kg. 3.6 ÷ 4 = 0.9

What if we had 3.7 ÷ 4 mean? kg: make 4 equal groups BUT, 37 ÷ 4 = 9 rem. 1 Each group will get kg and there will be kg left over. 3.7 ÷ 4 = 0.9 rem. 0.1

Dividing on: 3.7 ÷ 4 Model 3.7 ÷ 4 using base-10 blocks – use a flat as 1. What will be left over? Can we trade it? With what?

What is 8 ÷ 5?

Multiplying by Decimal Numbers 1m of wire weighs 6 grams. How much will 1.4 m of the same wire weigh?

Unit Approach 1.4 meters means meters. So, we have 14 groups of weight of 0.1 meter. Weight of 0.1 meter = 6 ÷ 10 = 0.6 Weight of 1.4 meters = 14 x 0.6

Make-It-Bigger Approach What if we were looking for the weight of 14 meters of the wire? Weight of 14 meters = 14 x 6 = 84 grams 14 meters are 10 times as long as 1.4 meters, so it must also weigh 10 times as much as the weight of 1.4 meters of the wire. Weight of 1.4 meters = 84 ÷ 10 = 8.4 grams

Dividing by Decimal Numbers 3.6 m of iron pipe weighs 9 kg. How much will 1m of the same pipe weigh?

Unit Approach 3.6 meters means meters. So, if we divide 9 by 36, we get the weight of 0.1 meter of the wire. To get the weight f 1 meter of the wire, we have to multiply by ÷ 36 = 0.25; 0.25 x 10 = 2.5 grams

Make-It-Bigger Approach 36 meters of the same wire will weigh 10x9=90 grams. To find how much 1 meter will weigh, you just have to divide 90 by 36.

Area Model of Multiplication The two factors are represented by the two dimensions of a rectangle. The product is represented by the area of the rectangle. Represent 24 x 13 using base-10 blocks.

24 x 13 or 2.4 x 1.3

Multiplying Fractions by Whole # You can paint 3/5 sq. feet with 1 pint of paint. How much can you paint with 2 pints?

Multiplying Fractions by Whole # You can paint 3/5 sq. feet with 1 pint of paint. How much can you paint with 2 pints?

Dividing Fraction by Whole # You can paint 4/5 sq. feet with 3 pints of paint. How much can we paint with 1 pint?

Dividing Fraction by Whole # You can paint 4/5 sq. feet with 3 pints of paint. How much can we paint with 1 pint?

Multiplying by Fractions With 1 pint of paint, you can paint 4/5 square feet. How much can we paint with 2/3 pints?

Multiplying by Fractions With 1 pint of paint, you can paint 4/5 square feet. How much can we paint with 2/3 pints?

Dividing by Fractions With 3/4 pints of paint we can paint 2/5 sq feet. How much can we paint with 1 pint?

Dividing by Fractions With 3/4 pints of paint we can paint 2/5 sq feet. How much can we paint with 1 pint?

Area Model of Multiplication

Measurement Division You need 2/3 cups of sugar to make 1 loaf of bread. If you have 8 cups of sugar, how many loaves of bread can you make?

Measurement Division with Drawing You need 2/3 cups of sugar to make 1 loaf of bread. If you have 8 cups of sugar, how many loaves of bread can you make?

Measurement Division with Drawing You need 2/3 cups of sugar to make 1 loaf of bread. If you have 8 cups of sugar, how many loaves of bread can you make?

Measurement Division with Drawing You need 2/3 cups of sugar to make 1 loaf of bread. If you have 8 cups of sugar, how many loaves of bread can you make?

Measurement Division with Pattern Blocks You need 2/3 cups of sugar to make 1 loaf of bread. If you have 8 cups of sugar, how many loaves of bread can you make?

Partitive Division with Cubes and Drawing 3/4 pounds of coffee cost $6. How much does a pound of the same coffee cost?

Partitive Division with Cubes and Drawing 3/4 pounds of coffee cost $6. How much does a pound of the same coffee cost?

Multiplication Makes Bigger? 1yd of cloth costs $3. What is the price of 11/3 yd of the same cloth? What is the price of 2/3 yd?

Division Makes Smaller? 1 1/3m of thin wire weighs 12 g and 2/3m of thick wire weighs 12g. How many g does 1m of each weigh?