Write as an expression: 5 more than a number Easy

The question

Question: write with math signs: 5 more than a number.

1 Change words to math

2 Put it in order

We start with a number, then add 5.

So we get n + 5.

3 Check

Let's check with a number.

Say the number is 10.

5 more than 10 is 15.

And 10 + 5 is 15 too.

So n + 5 is right!

Let's look back.

First: change words to math.

Then: put it in order.

Last: check.

▶ Watch it solved

Twice a number decreased by 3 Medium

The question

Question: write with math signs: twice a number decreased by 3.

1 Change words to math

2 Put it in order

So we get 2n − 3.

3 Check

Let's check with a number.

Say the number is 10.

Twice 10 decreased by 3 is 17.

And 2(10) − 3 is 17 too.

So 2n − 3 is right!

Let's look back.

First: change words to math.

Then: put it in order.

Last: check.

▶ Watch it solved

3 times the sum of a number and 2 Harder

The question

Question: write with math signs: 3 times the sum of a number and 2.

1 Change words to math

2 Put it in order

The sum is one amount, so it goes in brackets.

3 × (n + 2) is written 3(n + 2): the number goes in front, with no × sign.

So we get 3(n + 2).

3 Check

Let's check with a number.

Say the number is 10.

3 times the sum of 10 and 2 is 36.

And 3(10 + 2) is 36 too.

So 3(n + 2) is right!

Let's look back.

First: change words to math.

Then: put it in order.

Last: check.

▶ Watch it solved