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Add within 20 without Regrouping

Students add two numbers with a sum within 20 when no regrouping across 10 is needed (e.g., 12 + 4 = 16). They add ones to ones.

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Add within 20 without Regrouping

Grade 1 · Counting, Fluency, and Fact Strategies · question 1 of 3

0 of 12

12 rungs. A star at the top.

12 + 5 =

How it is taught

0:00 of 2:35

If ones stay small, just hop.

Keep the tens digit.

Read it: Count on or count back

7 + 3: start at 7 and count on 3: 8, 9, 10. 10 − 3: start at 10 and count back 3: 9, 8, 7.

  1. Start at the bigger number.
  2. Count on 1, 2 or 3 to add. Count back to take away.
  3. The last number you say is the answer.

Starting at 7 saves you counting all the way up from 1 again.

Each hop is 1 more, so 3 hops from 7 land on 10.

To take away, start at the big number and count back instead.

Start at the big number. Count on to add, count back to take away.

Saying 7 as the first count, and landing on 9.

7 is where you start. The first hop says 8: 8, 9, 10.

11 + 2 = ___ — 13. Start at 11. Count on 2: 12, 13.

12 + 4

Let's add! You have twelve marbles, and a friend gives you four more. How many marbles do you have now?

We can stack the numbers like this: twelve on top, plus four below.

Twelve is made of one ten and two ones. The four is just four ones.

We always start in the ones place. What is two plus four?

Two plus four is six! Write six in the ones place.

Now the tens place. There's one ten on top, and zero tens below.

One plus zero is one. Write one in the tens place.

12 marbles + 4 more = ?tensones12+461■■■■■■■■■■● ●● ● ● ●ANSWER16marbles
Grade 1 · 12 marbles plus 4 more

Twelve plus four is sixteen! You have sixteen marbles. Great job!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

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.

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.

An example week.

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