In this chapter on numbers to 40, students learn:
- numbers to 40
- comparing and order numbers
- number patterns
Numbers to 40
We stopped at numbers within 20 previously. In this chapter, students learn numbers from 21 to 40.
21: twenty one
22: twenty two
23: twenty three
24: twenty four
25: twenty five
26: twenty six
27: twenty seven
28: twenty eight
29: twenty nine
30: thirty
31: thirty one
32: thirty two
33: thirty three
34: thirty four
35: thirty five
36: thirty six
37: thirty seven
38: thirty eight
39: thirty nine
40: forty
For 2-digit number, one of the digit is in the ones place, and the other digit is in the tens place. We call this place values.
For instance, 34 consists of 3 tens and 4 ones. 3 is in the tens place, and 4 is in the ones place.
Comparing and ordering numbers
In comparing numbers, we learn to determine which number is greater and how much greater; which number is smaller and how much smaller.
In ordering of numbers, we learn how to order numbers from smallest to greatest and vice versa.
Number Patterns
We look at what's the missing number in number patterns.
