Day 26 of 30
Use doubles plus one strategy
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Learning Objective
I can use doubles plus one strategy.
Today we will learn how to use doubles plus one strategy. Math helps us solve problems and understand the world around us.
Doubles facts are addition facts where both addends are the same: 1+1=2, 2+2=4, 3+3=6, 4+4=8, 5+5=10, 6+6=12. Memorizing doubles is easy because you can visualize two equal groups. Doubles plus one: if you know 4+4=8, then 4+5=9 (one more). When adding three numbers, look for doubles first: 3+4+3 → (3+3)+4 = 6+4 = 10. Another strategy: make a ten first: 5+7+5 → (5+5)+7 = 10+7 = 17. These strategies leverage known facts to make mental addition faster.
Let's break this down step by step so it's easy to understand. Follow along with the examples, and don't worry if it takes some practice to get the hang of it!
Remember: Making mistakes is part of learning. If something is tricky, try again, look at the examples, or ask for help.
A question we need to solve
The answer to a problem
Instructions
Materials Needed
- Counters or objects
- Pencil
- Practice sheet
Practice Problem 1: Apply what you learned today.
Practice Problem 2: Try a similar problem on your own.
Challenge: Can you create your own problem like the ones we practiced?
Teaching Tip
For younger learners: Use concrete objects and hands-on activities when teaching use doubles plus one strategy. Keep sessions short (10-15 minutes) and incorporate movement or songs when possible.