Addition with renaming

Addition with renaming

(It used to be called “carrying”.)

Here is a number story:

There were 136 cars parked in the car park. Another 58 cars arrived and were parked too. How many cars were parked altogether?

Here is what we call a  number sentence to match this number story: 136+58 =

This is also called an equation. It is set out horizontally and has an equals sign. The value of the numbers on one side of the equals sign must have the same value as the numbers on the other side.

 Below is another way of setting out the addition problem.

It’s a vertical set out called an algorithm.

 First you label the columns to show the place value of the digits in the numbers that you are adding:

 H. T. O. ( A space is left that can be used for renaming.)

                    ↓ (This arrow means begin with the ones and to add down.)

      1 3 6

  +     5 8

_______

 

When you add the ones column 6+8 =14,

14 ones are renamed as 1 ten and 4 ones

 The 1 ten is shown in the tens column in the space that was left for renaming. It will be added with the tens. The 4 ones are put below the line in the ones place.

 

H. T. O

         1

      1 3 6

+       5 8

                4

Now add the tens column.  1+3+5    That’s 9 tens.

Then add the hundreds. The answer is 194.

Addition Fact Families

Addition and Subtraction Fact Families

You can turn around the numbers being added (the addends) and you will still have the same total.

If you know that 12+3= 15

then you know that 3+ 12= 15

Addition and subtraction are linked:

3+12=15

12+3=15

15-3=12

15-12=3

This is what we call a Fact Family.

Here is another;

24+6=30

6+24=30

30-24=6

30-6=24

It is important to notice that these subtraction facts begin with the largest number.

Now you could try making up some fact families of your own.

Marvellous Melbourne Student Reports

On Thursday the 1st of May, the grade threes went on an excursion. On the river cruise, we saw lots of artwork, black swans and a bridge with a train going every 20 seconds. We saw canoes and the people waved to us. In the city, we saw lots of buildings and one of the shiny ones had lots of triangles. Anastasia and Charlotte (3F)

We had a smashing time at the Yarra River. We learnt how to put life-jackets on and we explored GIANT bridges. One was a train bridge! Then we watched some street performers, they were so crazy! Ethan P (3D)

What an AWESOME day at our excursion! We explored the Yarra River, we went on a ferry and found heaps of weird birds. We found some cool water fountains. I found a tiny car and I was taller than it. When we were walking we found people on fake toilets. Who would do that? Eth D (3D)

When we dashed to the Yarra River, we hopped on the fabulous ferry. The driver told us some incredible facts, they were really interesting! The water looked very dirty, YUCK!        Brigitte (3D)

Whoa, what a day in the city. There were street performers, amazing paintings and tons of cool, colourful shops. How long has it been since you’ve been to Melbourne? Well come along, it’s FABULOUS!   Steph Z (3D)