Steply

Before, after, between

Elementary · 23 problems, easy to harder

▶ Watch the first one solved

How we do it

  1. Find 7
  2. Go one step right
  3. Write the number
  4. Check

The steps for What comes after 7. Every solution names its steps, so you always know what comes next.

Worked examples

What comes after 7 Easy

The question

Question: what comes after 7?

What comes after 7?

We write it in numbers.

The box is the number we want.

= 7, □

1 Find 7

Here is a number line.

2 Go one step right

We land on 8.

3 Write the number

So after 7 comes 8.

= 7, 8

4 Check

We check it the other way.

Before 8 comes 7.

Yes!

It works.

Before 8 comes 7

Let's look back.

First: find 7.

Then: go one step right.

Then: write the number.

Last: check.

Answer
= 7, 8

▶ Watch it solved

What comes after 19 Medium

The question

Question: what comes after 19?

What comes after 19?

We write it in numbers.

The box is the number we want.

= 19, □

1 Find 19

Here is a number line.

2 Go one step right

We land on 20.

3 Write the number

So after 19 comes 20.

= 19, 20

Careful!

After 9 ones, the ones start again at 0.

The tens go up by 1.

Careful: 19 → 20: the ones start again at 0

4 Check

We check it the other way.

Before 20 comes 19.

Yes!

It works.

Before 20 comes 19

Let's look back.

First: find 19.

Then: go one step right.

Then: write the number.

Last: check.

Answer
= 19, 20

▶ Watch it solved

What comes after 99 Harder

The question

Question: what comes after 99?

What comes after 99?

We write it in numbers.

The box is the number we want.

= 99, □

1 Find 99

Here is a number line.

2 Go one step right

We land on 100.

3 Write the number

So after 99 comes 100.

= 99, 100

Careful!

After 9 ones, the ones start again at 0.

The tens go up by 1.

Careful: 99 → 100: the ones start again at 0

4 Check

We check it the other way.

Before 100 comes 99.

Yes!

It works.

Before 100 comes 99

Let's look back.

First: find 99.

Then: go one step right.

Then: write the number.

Last: check.

Answer
= 99, 100

▶ Watch it solved

Practice

Try each one, then open the answer. Stuck? Open the problem to watch every step.

Easy

  1. what comes after 7
    Answer
    = 7, 8
  2. what comes after 12
    Answer
    = 12, 13
  3. what comes before 9
    Answer
    = 8, 9
  4. what comes before 15
    Answer
    = 14, 15
  5. what comes after 25
    Answer
    = 25, 26
  6. what comes before 31
    Answer
    = 30, 31
  7. number between 4 and 6
    Answer
    = 4, 5, 6
  8. number between 13 and 15
    Answer
    = 13, 14, 15

Medium

  1. what comes after 19
    Answer
    = 19, 20
  2. what comes after 39
    Answer
    = 39, 40
  3. what comes before 40
    Answer
    = 39, 40
  4. what comes before 70
    Answer
    = 69, 70
  5. what comes after 58
    Answer
    = 58, 59
  6. what comes before 86
    Answer
    = 85, 86
  7. number between 29 and 31
    Answer
    = 29, 30, 31
  8. number between 59 and 61
    Answer
    = 59, 60, 61
  9. number between 47 and 49
    Answer
    = 47, 48, 49

Harder

  1. what comes after 99
    Answer
    = 99, 100
  2. what comes before 100
    Answer
    = 99, 100
  3. what comes after 199
    Answer
    = 199, 200
  4. what comes before 300
    Answer
    = 299, 300
  5. what comes after 459
    Answer
    = 459, 460
  6. number between 99 and 101
    Answer
    = 99, 100, 101