This document provides an introduction to whole numbers and numbers to 20. It discusses counting, reading, writing, comparing and ordering numbers, as well as number patterns and place values. Key concepts covered include: 1) numbers can be written as numerals or words; 2) 1 and 2 digit numbers; 3) counting items and arranging numbers in order from greatest to smallest; 4) completing number patterns by adding or subtracting the same amount; and 5) understanding place value where a digit's value depends on its place in the number. Examples are provided to illustrate place value in numbers like 8, 7, 10, 13 and their digit values in the tens and ones

1. Whole Numbers
Numbers to 20
What will we learn today?
• Count, read and write numbers
• Comparing and ordering numbers
• Number patterns
• Place Values

2. 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

3. Let’s count the items below.
1
2
3
1 2 3 4 5 6 7 8 9 10 11 12

4. Arrange the numbers in order.
Begin with the greatest.
4 10 13 17
17, 13, 10, 4
greatest

5. Arrange the numbers in order.
Begin with the smallest.
8 16 11 5
5, 8, 11, 16
smallest

6. Complete the number patterns.
2 3 4 5 6
+1 +1 +1 +1

7. One more example for you.
14 12 10 8 6
-2 -2 -2 -2

8. Place Values
Place value is the value of a digit depending on
its place in a number.
Place Value Chart
= 1 unit
Tens Ones
0 8
0 ten 8 ones = 8
8
8 ones = 8
8 units are not enough to make a group of ten, so it
has 1 place value, that is the ones place.

9. One more example for you.
Place Value Chart
Tens Ones
0 7
7
7 = 0 ten 7 ones
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.

10. Here’s another example.
Place Value Chart
Tens Ones
1 0
1 ten 0 ones =10
1 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.

11. Here’s another example.
Place Value Chart
Tens Ones
1 3
1 ten 3 ones = 13
10 3
1 group of ten

12. Are you ready to
try out the
questions?