working with numbers to 100 les 1

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Working with numbers

Working with numbers

Can you count to 100 really fast?
You might think “sure”
One, two, skip a few, a hundred!
A good way to learn how to count to 100 is by counting by fives or tens to 100.
Try it now.

5, 10, 15, 20, 25,

 30, 35, 40, 45, 50,

55, 60, 65, 70, 75,

80, 85, 90, 95, 100

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

When you count by fives or tens, you are skip counting

You should also learn to skip-count by twos and by threes.

You can practice skip counting by reading only the numbers in color in the next slide. Keep practicing until you can do it without looking at the numbers

skip counting practice

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

What is skip-counting

1. Just counting
2. Skip the same amount of numbers
3. Skip nothing
4. Skip random numbers

Some special math words

When you add numbers together; the numbers you add are called the addends.

The answer you get is called the sum.

Explanation

  5        }

+3        } addends

------

   8 sum

You can have more than two addends. What are the addends here?
2 +3 +5 =10

1. 2 and 3
2. 3 and 5
3. 10
4. 2and 3 and 5

Can you tell me in your own words what a sum is?

Difference

When you subtract, the number left over is called the difference

In 9 - 7 = 2, the difference is 2.

What is the difference here?
7
-4
-----------
=

1. 2
2. 3
3. 5
4. 11

Ik hoop dat de uitleg duidelijk was.
Als het niet zo is, wil ik graag weten wat je nog niet begrijpt