2 of 11

Lesson Name: Decimals

Teacher Notes:

Donkey Kongs

Review Decimals

What are they? How do they relate to what we already know? How can our knowledge of fractions help us?

Subtraction with decimals:

Review place value houses, values of numbers, etc
1.25 + 1.4, 1.56 + 1.02 etc
2.25 - 1.14, 2.587- 1.433, etc
3.43 - 2.26, etc

Have the students try these on their own first. What strategy are they using? Work out what the main misconceptions are

Strategy: Don’t subtract add & Rounding
3.08 - 2.3, 4.205 - 2.142, etc

Pongs

Review Decimals

What are they? How do they relate to what we already know? How can our knowledge of fractions help us?

Subtraction with decimals:

Review place value houses, values of numbers, etc
3.78 - 1.34, 2.67 - 1.43, etc
Focus on place value: 3.28 - 2.3, 2.35 - 1.4
Strategy: Don’t subtract add

3 of 11

Problem Solving: Week 2

A carpenter bought a piece of wood that was 2.8 metres long. Then he sawed 0.9 metres off the end. How long is the piece of wood now?

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Problem Solving: Week 2

Cindy mixed 1.94 grams of salt into a pot of soup she was cooking. Before she served the soup, Cindy added 0.92 grams of salt. How much salt did Cindy put into the soup in all?

5 of 11

Lesson Name: Decimals

Teacher Notes:

Donkey Kongs

Subtraction multiple ways

Don’t subtract add: 4.34 - 1.29 = [ ] ==== 1.29 + [ ] = 4.34 etc
Subtract using place value 2.431 - 1.234 = [ ]

2.431 - 0.004 =
- 0.03
- 0.2
- 1

Place value houses tenths, hundredths, thousandths

10 hundredths = 1 tenth etc

6 of 11

Lesson Name: Multiplication

Teacher Notes:

15 x 4= [ ] Multiply in parts i.e. (10 x 4) + (5 x 4)
234 x 7 = [ ] i.e (200 x 7) + (30 x 7) + (4 x 7)

32 x 45 = [ ] Breaking it down

30 x 45 (30 x 40) + (30 x 5)
2 x 45 (2 x 40) + (2 x 5)

Algebra (problem solving

7 of 11

Lesson Name: Multiplication

Mr Moran and Mr Goodwin bought Pizza from pizza hut. Each pizza was $6 each.

�Mr Moran had 4 times as many pizzas as Mr Goodwin, and Mr Goodwin had 3 pizzas.

How much money did Mr Moran spend?

(also why did he need so much pizza??)

8 of 11

Lesson Name: Multiplication

The number of KFC chairs in Rooms six, seven, and eight can be solved with the equation:

y = X x 1.5.

The number of the chairs in Rooms 6,7,8 is One and Half times the number of KFC chairs in Rooms 9 & 10.

Is this enough information to solve the equation?

9 of 11

Lesson Name: Multiplication

Teacher Notes:

36 x 5 =

Place value: (30 x 5 = 150), (6 x 5 = 30), (150 + 30 = 180)

Doubling and Halving: 18 x 10 = 180

Rounding and compensating: (40 x 5 = 200), (4 x 5 = 20), (200 - 20 =180)

84 / 4 =

Reversibility: 4 x ( ) = 84, (4 x 20 = 80), (4 x 1 = 4), (20 + 1) = 21

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Multiplication

Stacey wants to make chocolate chip cookies to take to a bake sale at her work. She only has 125 grams of chocolate chips, and each cookie needs 5 grams.

How many cookies can she make?

11 of 11

Lesson Name: Multiplication

There were 126 people aboard the Ferry. To be safe the captain needs to know that everyone would have a seat in a lifeboat if the ferry ran into trouble.

Each lifeboat has 9 seats. How many lifeboats would the ferry need so that everyone was safe?