Maths

Perimeter and Area

We measure length in meters, centimeters, millimeters and kilometers

1 centimeter = 10 millimeters
1 meter = 100 centimeters
1 meter = 1000 millimeters
1 kilometer = 1000 meters

m = meter
cm = centimeter
mm = millimeter
km = kilometer

Bang on Time

Click on the clock and play this fun game about telling the time.


 Converting Units
 

Numeracy Strategies 

Stage 5: Early additive

Students at this stage have begun to recognise that numbers can be split into parts and recombined in different ways. This is called part-whole thinking.
Strategies used at this stage are most often based on a group of ten or use a known fact, such as a double. For example:
           38 + 7 as (38 + 2) + 5
           24 – 9 as (24 - 10) + 1
           7 + 8 as (7 + 7) + 1

Strategies used at this stage for addition /subtraction include:

• using doubles
      7 + 8 as (7 + 7) + 1
• up through a ten
      38 + 7 as (38 + 2) + 5
• compensation
      24 – 9 as (24 - 10) + 1.

Stage 6: Advanced additive

Students at this stage are familiar with a range of part-whole strategies (see stage 5) and are learning to choose appropriately between these. They have well developed strategies for solving addition and subtraction problems, for example:
367 + 260 as (300 + 200) + (60 + 60) + 7
135 – 68 as 135 – 70 + 2
703 – 597 as 597 + ? = 703
They also apply additive strategies to problems involving multiplication, division, proportions and ratios. For example:
6 x 3 = (5 x 3) + 3 = 15 + 3 = 18
One quarter of 28 as 14 + 14 = 28 so 14 is one half, 7 + 7 = 14 so 7 is one quarter

 Strategy being developed

Students at this stage can recognise that numbers can be split into parts and recombined in different ways. Students are learning to extend the range of strategies they can use to solve problems and learning how to choose an appropriate strategy.

1. Addition and Subtraction with a range of strategies
   For example, 324 – 86 = 324 – 100 + 14
2. Multiplication and Division using known facts and derived multiplication
   For example, 9 x 6 is (10 x 6) – 6= 54
3. Proportions and Ratios - find a fraction of a set using addition and multiplication
   For example, 1/3 of 36 = 3 x 10 = 30 and 3 x 2 = 6, then 10 + 2 = 12. 

These strategies include:

• using standard place value
      367 + 260 as (300 + 200) + (60 + 60) + 7
• using rounding to tidy numbers
      135 – 68 as 135 – 70 + 2
• reversing
      Solving subtraction by addition: 703 – 597 as 597 + ? = 703
• finding equal differences
      324 – 188 as 336 – 200

Working towards stage 7...

Using standard place value for Mult/Div
    43 × 6 as (40 × 6) + (3 × 6) - these are good to practice at home :)