Question

The double of the difference of and 3 is written as _____.

Answer 1

Answer:

Doubles

To get a double of a number, we add the same number to itself. For example, double of 2 is 2 + 2 = 4.

Example: Michelle has 4 marbles and Jane has double the marbles that Michelle has. How many marbles does Jane have?

The double of 4 is 8.

Doubles

So, Jane has 8 marbles with her.

It is easy to remember the numbers that we get by doubling one-digit numbers.

Doubling one-digit numbers

Doubles in addition:

The addition of any two consecutive numbers can be done by using doubles plus 1 or doubles minus 1 strategy.

Example: 2 + 3

The number 3 is one more than 2. So, we can write 3 as 2 + 1. So, the addition 2 + 3 can be shown as:

Doubles in Addition Examples

We already know the double of 2 is 4.

So, the required sum is one more than double. That is 5. Therefore, 2 + 3 = 5.