Numbers to 20
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Transcript of Numbers to 20
Whole Numbers
Numbers to 20
What will we learn today?
• Count, read and write numbers • Comparing and ordering numbers• Number patterns• Place Values
Introduction to Numbers
Number can be written in numerals or in words.Numerals – 1, 2, 3, ………….Words – one, two, three, ………
1 digit numbers – 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
2 digit numbers – 10, 11, 12,…………….....99
Let’s count the items below.
There are 12 pencils.
How do we express the number?
Numeral : 12Words : twelve
There are 3 books.
How do we express the number?
Numeral : 3Words : three
1
2
3
1 2 3 4 5 6 7 8 9 10 11 12
Arrange the numbers in order.Begin with the greatest.
4 10 13 17
17, 13, 10, 4greatest
Arrange the numbers in order.Begin with the smallest.
8 16 11 5
5, 8, 11, 16smallest
Complete the number patterns.
+1
+1
+1
+1
2 3 64 5
-2 -2 -2 -2
14 12 810 6
One more example for you.
Place Values
Place Value Chart
Tens Ones
0 8
= 1 unit
0 ten 8 ones = 8
8 ones = 8
Place value is the value of a digit depending on its place in a number.
8 units are not enough to make a group of ten, so it has 1 place value, that is the ones place.
8
7 = 0 ten 7 ones
Place Value Chart
Tens Ones
0 7
Since 7 units are not enough to make a group of ten and number 7 is a single digit number, it has 1 place value that is the ones place.
For the ones place value, it is only fit for a single digit number; number 1-9.
7
One more example for you.
Place Value Chart
Tens Ones
1 0
1 ten 0 ones =101 ten = 10
10 ones = 10
= 10 (base ten or 1 group of 10)
Every number in a two digit number has a different place value. Number 10 is a 2 digit number, therefore digit 0 is in the ones place and the digit 1 is in the tens place.
Here’s another example.
Here’s another example.
Place Value Chart
Tens Ones
1 3
1 ten 3 ones = 13
10 3
1 group of ten
Are you ready to try out the questions?