Addition and subtraction within 20
Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
Teaching approaches
Gakuva’s recommended starting approach is selected. You can still compare every option.
1 approach
If your child needs to work out '8 + 6', can they split the 6 into 2 + 4, use the 2 to fill up to 10, then add the remaining 4 to get 14?
Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
Robot Addition
Addition matching with an Addition to 20 mode for facts within 20. Pair with adult talk about making ten or using a known fact when a level feels hard.
Proof: Save a screenshot from Addition to 20 mode plus a parent note describing one making-ten or known-fact strategy the learner used.
Addition & Subtraction Facts
Number-line visualization of addition and subtraction facts through 20 for connecting equations to quantities.
Proof: Save a screenshot of an equation within 20 and a parent note that the learner explained the move on the number line.
Math Mine Addition Subtraction
Solve addition and subtraction equations and clear numbered blocks. Keep problems within 20 and pause to name the strategy used.
Proof: Save a Problems Solved screenshot plus a parent note of correct addition and subtraction examples within 20.
Explore the learning path
2 before · 5 after
This concept
Check understanding
- Solve 8 + 6 using making ten: 8 + 2 + 4 = 14
- Solve 13 − 4 by decomposing: 13 − 3 − 1 = 9
- Use a known fact (8 + 4 = 12) to derive 12 − 8 = 4
“If your child needs to work out '8 + 6', can they split the 6 into 2 + 4, use the 2 to fill up to 10, then add the remaining 4 to get 14?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 6–7
Standards