Fluent adding and subtracting within 10
Fluently add and subtract within 10
What a learner can do afterwards
- Answer any addition fact within 10 quickly from memory
- Answer any subtraction fact within 10 quickly from memory
- Complete a timed set of within-10 facts with high accuracy
1 · Read
You know your number bonds and can already add and subtract quickly within 5. Learn every fact within 10 until the answer comes to mind without counting on your fingers or stopping to think.
Leo has 10 apples and gives 4 to his friend. He knows 10 − 4 = 6, so he does not need to count the remaining apples one by one.
When a fact feels slow, use a nearby fact you know. Since 5 + 5 = 10, 5 + 4 is 9, one less. Practice until each answer comes quickly, without counting.
Know every addition and subtraction fact within 10 so answers come quickly and correctly.
2 · Watch
Take it off screen
Where it sits
This opens up
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
18 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.