Making 100 Matching Cards
In the elementary grades, it is critical to build students’ understanding of the base ten number system by learning about the relationship of numbers to important landmarks—“friendly numbers”, that make for simple calculations, and to which other numbers can be related, such as 5, 10, 50 and 100.
In first and second grade, the focus is on breaking 100 into parts. Hundred charts can provide models of how any number is related to the nearest multiples of 10 and how any number can be broken apart into 10’s and 1's. Most of the addition and subtraction strategies students develop are based on one of these two ideas.
These “Making 100 Matching Cards” can help students find pairs of numbers that add up to 100; order and compare 2 digit numbers and subitize cards using 5, 10 and 50 as benchmark numbers.