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Math · Grade 1 Math

Chapter 1: Seeing Numbers to 10

One More, One Less

Find one more or one less without recounting.

Lesson
7
Time
About 14 minutes
0 of 16 done
Part 1 of 7Let's Learn

Step 1: Let's Learn

Read it, or press Listen and follow the words.

Watch the idea first — 50 seconds. Then read on, and try it yourself in the next step.

One more than a number is just the next number you say.

Hop along the path

On a number path, one more is one square forward. One less is one square back.

You do not go back to 1. You already know where you are.

One step, not a new count

You are standing on 7. One more: step forward once. You are on 8. One less: step back once. You are on 6. You never went back to 1. Seven has six below it and eight above it. You can go either way.

Step 2: Try It Yourself

Hop one square and say the number.

Say the answer first. Then tap One more or One less to check.
The same number as a heap rather than a distance.

How many4

6 more would make 10.

Step 3: In Real Life

Bus stops

You get on at stop 4. The next stop is 5. One more. Going back, it is 3. One less.

Step 4: Watch an Example

Watch a hop, then predict the next.

Watch Leo Hop

Leo has the marker on 7. He wants one more.

  1. Step 1

    He does not start at 1. He starts where the marker is: 7.

Watch Mia Hop Back

Mia has the marker on 3. She wants one less. She starts. You finish.

  1. Step 1

    She does not start at 1. She starts on 3.

    Marker3

Step 5: Your Turn

Practice makes it stick.

Building a Tower

Problem 1 of 12

Leo has a tower of 6 blocks. He adds 1 more. How tall is it now?

The tower
He adds

Birds on a Wire

Problem 2 of 12

10 birds sit on a wire. 1 flies away. How many are left?

Quick Hops

Answer from where you are. Do not count from one.

Problem 3 of 12

What is one more than 8?

Problem 4 of 12

What is one less than 5?

Problem 5 of 12

What is one more than 9?

Find the Mistake

A friend hopped. Can you spot the slip?

Problem 6 of 12

Sam wants one more than 2. He lands on 1. What did Sam do?

Problem 7 of 12

What is one more than 2?

Problem 8 of 12

Ana wants one less than 9. She lands on 7. What did Ana do?

Problem 9 of 12

What is one less than 9?

Which Way?

Pick the better way.

Problem 10 of 12

One more than 5. Which way is quicker?

Problem 11 of 12

The frame has 7 counters. You want one less. What do you do?

Move the Marker

Build it, then check.

Problem 12 of 12

Put the marker on 4.

Move the marker.

Step 6: Quick Check

Show what you know.

Question 1 of 2

What is one more than 4?

Question 2 of 2

What is one less than 7?

Ready for more?Optional. Past the lesson, for anyone who wants it.

Stretch 1 of 1

I am one more than 8. I am one less than 10. What number am I?

What You Learned

  • One more is the next number.
  • One less is the number before.
  • You do not need to count from one.
For the grown-up

Counting and knowing how many are different skills. A child can recite to twenty and still recount a row of six every time they are asked, because the last number said has not yet become the answer to "how many".

Watch for recounting. If they count a group, are asked how many, and start again from one, the link has not formed yet. It is extremely common at this age and is not a memory problem.

When it happens, count together slowly and then close your hand over the group and ask again. Hiding the objects is what forces the number to stand in for them.

Why it is the next number — Adding one object moves you one step along the counting words. Those are the same move, which is why you never need to recount.

Every number sits between two — Seven has six below and eight above. Knowing both neighbors means you can move either way without starting over.