2.OA.3. Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends

 

View interactive resources for all Grade 2 Common Core Standards

 
ITP Number Grid ITP Number Grid

View full screen in your browser.  This ITP generates a 100 square. Choose a colour or the grey mask. You can then click on individual cells to hide or highlight them in different colours, and by clicking on the box at the left-hand foot of the grid and using the pointers you can hide or highlight rows and columns. The prime numbers and multiples can also be highlighted.
You can change the number of columns from 3 up to 13, the starting number, and its position – either top left corner or bottom left corner of the grid. Choose the mask option to create a temple that can be moved around the grid to hide or highlight particular groups of cells. The template can be rotated using the single arrow button.
The ITP can be used to explore different multiples, number sequences and patterns on grids of different sizes. The superimposed masked template can provide practice at adding groups of numbers and enable children to hypotheses about the sums and difference of the numbers.
The ITP can develop children’s ability to predict and generalise. Changing the number of columns provides a new grid to test general statements about the relationships between numbers and to look for counter examples.

This resource is freely available to download from the archived Primary Framework site.

For more addition and subtraction resources click here.

Venn sort numbers Venn sort numbers

Sort numbers on a Venn diagram. Sort according to one or two properties, including: odd, even, multiples, square numbers, prime numbers, triangular numbers, numbers less than 30 or more than 50.

For more resources involving sorting shapes and numbers click here.