About cookies

The NCETM site uses cookies. Read more about our privacy policy

Please agree to accept our cookies. If you continue to use the site, we'll assume you're happy to accept them.

 

Personal Learning Login






Sign Up | Forgotten password?
 
Register with the NCETM

1.10 Composition of numbers: 11–19


Created on 31 July 2017 by ncetm_administrator
Updated on 16 January 2018 by ncetm_administrator

Introduction

Explore the ten-and-a-bit nature of the numbers 11–19, using the partitioning structure; apply number facts within ten to addition and subtraction of single-digit numbers to/from the numbers 11–19.

Teaching points

  • Teaching point 1: The digits in the numbers 11–19 tell us about their value.
     
  • Teaching point 2: The numbers 11–19 can be formed by combining a ten and ones, and can be partitioned into a ten and ones.
     
  • Teaching point 3: A number is even if the ones digit is even; it can be made from groups of two. A number is odd if the ones digit is odd; it can’t be made from groups of two.
     
  • Teaching point 4: Doubling the numbers 6–9 (inclusive) gives an even teen number; halving an even teen number gives a number from six to nine (inclusive).
     
  • Teaching point 5: Addition and subtraction facts within 10 can be applied to addition and subtraction within 20.
     

 
 

Comment on this item  
 
Add to your NCETM favourites
Remove from your NCETM favourites
Add a note on this item
Recommend to a friend
Comment on this item
Send to printer
Request a reminder of this item
Cancel a reminder of this item

Comments

If you have any comments please contact us.