Numbers to 20
- 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?