Mathematics·Addition & Subtraction·procedural
Adding within 100
Add within 100 using strategies based on place value, including adding a two-digit and one-digit number, and a two-digit and a multiple of 10
Suggested ages 6–7
Learning journey
Your child is building strong foundations in addition and subtraction — learning to add and subtract numbers fluently within 20, understanding the relationship between these operations, and applying various mental strategies to solve problems.
Evidence of understanding
- Calculate 46 + 7 using place value (46 + 4 + 3 = 53)
- Calculate 38 + 40 = 78 using tens understanding
- Relate the strategy to a written method and explain the reasoning
Assessment prompt
Can Adding within 100 work out sums like '47 + 8' or '35 + 50' by thinking about the tens and ones separately rather than counting up one at a time?
Standards alignment
1.NBT.4US · ccss-math
Add within 100
Common Core State Standards for Mathematics · 1