Students combine two groups with a total of 5 or fewer using objects, drawings, or fingers. They connect the action of joining to simple equations like 2 + 3 = 5.
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Real questions from this skill, graded here. No account, and nothing is saved.
Kindergarten · Addition and Subtraction Within 10 · question 1 of 3
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12 rungs. A star at the top.
There are 2 red apples and 2 green apples. How many apples in all?
How it is taught
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Adding joins two small groups.
The sum is how many in all.
Read it: Adding by counting on
You have 4 crackers. Your brother gives you 3 more. You could count them all again from 1, but you already know the first plate is 4.
Say the number you already know: 4.
Count on, 1 number for each new cracker: 5, 6, 7.
The last number you say is the total: 4 + 3 = 7.
Counting all from 1 works, but it is slow, and it gets slower as the numbers grow.
Counting on starts from a number you already trust, so there is less to count and less to lose track of.
Start from the bigger number: for 3 + 4, say 4, then count on 5, 6, 7.
To add, start at the bigger number and count on the other one.
Saying the starting number as the first count: "4, 5, 6" for 4 + 3, and answering 6.
The starting number is what you already have. The counting begins with the first new cracker: 5.
3 + 2 = ___ — 5. Start at 3 — the number you already know — and count on 2: 4, 5.
2 + 3 = 5
Let's learn how to add. Adding means putting two groups together to find how many in all.
Here are two red apples on the table.
Now three more green apples come along.
Let's put them together into one big group.
Now we count them all. One…
two…
three…
four…
five! There are five apples in all.
Kindergarten · Putting two groups together
We can write this as a number sentence: two plus three.
Equals five.
Two plus three equals five. Great job adding!
What you see
While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.
M
MayaGrade 3 · Mathematics
Did you know?
A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.
Today’s goal
1 star — one skill mastered, every rung of its ladder climbed
Climbing now
Divide within 100
An example student.
M
MayaGrade 3 · Mathematics
Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.