Use Repeated Addition with 10s

Students compute the total of an array with rows of 10 by adding 10 repeatedly (e.g., 10 + 10 + 10 for 3 rows of 10).

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Grade 2 · Rectangular Arrays and Repeated Addition · question 1 of 3

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12 rungs. A star at the top.

2 strings hold 10 beads each. How many beads are on the strings?

How it is taught

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Repeated addition of tens means adding ten again and again.

Each group is ten.

Read it: Count by tens

5 tens: 5 groups of 10. Jump 10 at a time from 0: 10, 20, 30, 40, 50. So 5 tens = 50.

Start at 0.
Jump 10 for each ten: count by tens.
The last number you land on is how many.

Each jump is a group of 10, so 5 jumps make 50.

10 + 10 + 10 is 3 tens: 30.

Counting by tens is faster than counting by ones.

Count by tens: each ten is one jump of 10.

Saying 5 tens is 5.

5 tens is 5 groups of 10: 10, 20, 30, 40, 50. That is 50.

9 groups of 10 = ___ — 90. Count by tens: 10, 20, 30, 40, 50, 60, 70, 80, 90. 9 tens = 90.

10 + 10 + 10 + 10

Mia has four packs of stickers. Each pack has ten stickers inside. How many stickers does she have in all?

The first pack has ten stickers. We write ten.

The second pack adds another ten. Ten plus ten is twenty.

The third pack adds ten more. Twenty plus ten is thirty.

And the last pack adds ten again. Thirty plus ten is forty.

On a number line, we hop by tens: zero, ten, twenty, thirty, forty.

Grade 2 · 4 packs of 10 stickers

So ten plus ten plus ten plus ten equals forty.

Mia has forty stickers in all. Adding the same number again and again is called repeated addition!

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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