Mathematics
First Grade Curriculum
Chapter 12, Numbers to 40
Children have learned counting skills as well as basic operations in adding and subtracting numbers to 20. Children understand the strategy of making a ten as well as the purpose of place value charts. Children can compare and order numbers to 20 based on their understanding of each 2 digit number being made up of tens and ones. Children have encountered number patterns with numbers up to 20. These form an important basis for the counting, comparing, and ordering of numbers to 40.
Counting on to 40 is a smooth progression from where children stopped, at 20, in previous chapters. The general form of the numbers in words from 20 to 40 is twenty-ONE, twenty- TWO,... thirty-one, thirty-TWO,... this gives children a sense of how the numbers beyond 40 may be written.
The place value chart enables children to make comparisons between two or more numbers, when tens are different or when tens are equal. In being able to compare two numbers, children apply this knowledge when they order numbers in ascending or descending order. With children familiar with the counting, comparing and ordering of numbers to 40, they are then able to identify the pattern within a number pattern.
This builds the foundation that children will rely upon when they learn about numbers to 100 in future chapters.
Chapter 12, Numbers to 40
Children have learned counting skills as well as basic operations in adding and subtracting numbers to 20. Children understand the strategy of making a ten as well as the purpose of place value charts. Children can compare and order numbers to 20 based on their understanding of each 2 digit number being made up of tens and ones. Children have encountered number patterns with numbers up to 20. These form an important basis for the counting, comparing, and ordering of numbers to 40.
Counting on to 40 is a smooth progression from where children stopped, at 20, in previous chapters. The general form of the numbers in words from 20 to 40 is twenty-ONE, twenty- TWO,... thirty-one, thirty-TWO,... this gives children a sense of how the numbers beyond 40 may be written.
The place value chart enables children to make comparisons between two or more numbers, when tens are different or when tens are equal. In being able to compare two numbers, children apply this knowledge when they order numbers in ascending or descending order. With children familiar with the counting, comparing and ordering of numbers to 40, they are then able to identify the pattern within a number pattern.
This builds the foundation that children will rely upon when they learn about numbers to 100 in future chapters.
