Add a Two-Digit and a One-Digit Number with Regrouping

Students add a two-digit number and a one-digit number when the ones digits sum to 10 or more, requiring a new ten (e.g., 37 + 6 = 43).

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Grade 1 · Comparing and Computing with Two-Digit Numbers · question 1 of 3

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12 rungs. A star at the top.

28 + 5 =

How it is taught

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When ones make ten or more, trade.

Ten ones become one new ten.

Read it: Add ones to a 2-digit number

36 + 7. 36 is 3 tens and 6 ones. 6 and 7 make 13 ones, and 10 of them make a new ten: 4 tens and 3 ones, 43.

Split the number into tens and ones: 3 tens and 6 ones.
Add the ones: 6 and 7 make 13 ones.
10 ones make a new ten: 4 tens and 3 ones, 43.

Only the ones are added, so the tens stay until the ones reach 10.

10 ones are the same as 1 ten, so they are bundled.

When the ones stay under 10, the tens do not change: 52 + 4 = 56.

Add the ones. 10 ones make a new ten.

Writing 313 for 3 tens and 13 ones.

13 ones is 1 ten and 3 ones: 4 tens and 3 ones, 43.

46 + 8 = ___ — 54. 6 and 8 make 14 ones: a new ten and 4. 54.

37 + 6

Let's add thirty-seven plus six. The ones will add up past ten, so we'll need a new ten.

Stack them up. Line up the ones with the ones, and the tens with the tens.

Start with the ones column. What is seven plus six?

Seven plus six is thirteen. But thirteen has two digits — it can't all fit in the ones place.

Thirteen is one ten and three ones. We split it apart.

Grade 1 · Making a new ten when ones add past 9

Write the three ones below the line in the ones place.

Carry the one ten up to the top of the tens column.

Now add the tens. One plus three is…

Four! Write four in the tens place.

Thirty-seven plus six is forty-three. Great job regrouping!

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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