Number bonds to 10; add to next 10 (suggested as 2 days)
Add by bridging 10 using number bonds (suggested as 3 days)
Bridge 10 to subtract with number bonds (suggested as 2 days)
Planning and Activities
In-depth Investigation: Pairs of Numbers
Find all the pairs of numbers which make 10, 11, 12 and 13. Pairs of Numbers from nrich.maths.org.
Ruth's top tips: Subtraction Strategies for KS1 from YouTube.com