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Mentally Find 10 More

Students mentally find 10 more than a given two-digit number by increasing the tens digit by one while keeping the ones digit the same (e.g., 10 more than 43 is 53).

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Mentally Find 10 More

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

0 of 12

12 rungs. A star at the top.

19 + 10 =

How it is taught

0:00 of 2:25

10 more is the next bigger ten.

The ones digit stays the same.

Read it: 10 more, 10 less: 1 jump

Start at 64. 1 jump of 10 forward lands on 74. 1 jump of 10 back lands on 54.

  1. Find your number on the line.
  2. Jump forward 10 for 10 more, or back 10 for 10 less.
  3. Read the number you land on.

Each jump of 10 moves 1 mark along the line.

The tens change and the ones stay: 54, 64, 74.

You do not count 10 little steps. 1 jump is 10.

10 more: jump forward 10. 10 less: jump back 10.

Counting 1 more from 64 instead of 10 more.

A jump is 10, not 1. From 64, 10 more is 74 and 10 less is 54.

40 + 10 = ___ — 50. 1 jump of 10 from 40 lands on 50 — 1 mark along, not 10 little steps.

10 more than 43

What number is ten more than forty-three? Let's figure it out together.

Here's a number line from forty to sixty.

Forty-three is right here.

To find ten more, we jump forward ten spaces.

We land on fifty-three!

Now look at the digits. Forty-three has four tens and three ones.

When we add ten, the tens digit goes up by one. Four becomes five.

What is 10 more than 43?4060435343+105343tensones+153ANSWER5310 more than 43
Grade 1 · The tens digit goes up by one

The ones digit stays the same — three is still three.

So forty-three becomes fifty-three.

Ten more than forty-three is fifty-three. Great work!

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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