## Keep adding up in your head to ten thousand, a hundred thousand, a million...

These tasks are designed to practice mental arithmetic. Add up to a full ten thousand, one hundred thousand or one million.

It is important that you calculate from the ones over the tens etc. always further up to the full ten thousand.

An example should make this exercise easier for you, if not everything is clear yet.

**77 + 23 = 100**, then add up to 100.

**8764 + ____ = 10 000?**

We start with the ones digit: + 6 together with 4 makes 10. But this results in a carry for the tens digit. This means now: 7 + 3 = 10 for the next digit and so on.

**8764 + 1236 = 10 000**

As you can see, padding is easier than figuring out the **inverse**:

10 000 – 8764 = 1236

The worksheet with these tasks is part of the exercise booklet

**Maths lesson 4 - Fit for the next level**

## The online exercises - add up

Exercise 1 - Add to 10 000 (ten thousand)

Exercise 2 - Add to 100 000 (one hundred thousand)

Exercise 3 - Add to 1 000 000 (one million)