Get your students making ‘Friends of 20’ with this activity!  Students will be required to perform mental arithmetic (with the aid of concrete materials, such as counters and number lines if required) to determine three numbers that add up to twenty. Students are working with counting on strategies, even when working with three numbers. They count on to add the first two numbers together and then count on again to twenty.

Get your students making ‘Friends of 20’ with this activity! Students will be required to perform mental arithmetic (with the aid of concrete materials, such as counters and number lines if required) to determine three numbers that add up to twenty. Students are working with counting on strategies, even when working with three numbers. They count on to add the first two numbers together and then count on again to twenty.

Get your students making ‘Friends of 20’ with this activity! Students will be required to perform mental arithmetic (with the aid of concrete materials, such as counters and number lines if required) to determine three numbers that add up to twenty. Students are working with counting on strategies, even when working with three numbers. They count on to add the first two numbers together and then count on again to twenty.

Get your students making ‘Friends of 20’ with this activity! Students will be required to perform mental arithmetic (with the aid of concrete materials, such as counters and number lines if required) to determine three numbers that add up to twenty. Students are working with counting on strategies, even when working with three numbers. They count on to add the first two numbers together and then count on again to twenty.

All you need is a deck of playing cards and some whiteboard markers and you’re ready to go. With this Friends of 10 activity, your students will use mental strategies to build number relationships and understand that addition is the joining two groups.

All you need is a deck of playing cards and some whiteboard markers and you’re ready to go. With this Friends of 10 activity, your students will use mental strategies to build number relationships and understand that addition is the joining two groups.

Problem solving is one of the proficiency strands in all year levels for mathematics in the Australian Curriculum. Let this resource from Project Nature-Ed help you explicitly teach problem solving skills to your students.

Ask a Mathematician - Problem Solving Toolbox - choose the right tools for the job - Designed by Teachers

Lots of ways to use this Project Nature-Ed resource for differentiation in the classroom. Use the operation cards at the back of the Friends of 20 resource plus a pack of number cards and students can begin to record the number sentences of Friends of 20 by including mathematical symbols.

Students can begin to record the number sentences of Friends of 20 by including mathematical symbols.

Making Friends of 10. An explicit teaching model has been provided via a Powerpoint presentation which gives students the opportunity to use a tens frame to find the missing number of friends.

Making Friends of An explicit teaching model has been provided via a Powerpoint presentation which gives students the opportunity to use a tens frame to find the missing number of friends.


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