In this lesson:
Adding and subtracting 2-figure numbers that don’t involve any carry figures
Adding 2-Figure Numbers
Suppose you want 22 + 34.
You can imagine the numbers one below the other if you like:
You can see that the tens total is 5 and the units total is 6, which gives 56.
This is easy because there are no carries.
Another way to add 22 + 34 is to start with the bigger number, 34, and add 20. This makes 54.
Then add the 2 to make 56.
Subtractions too can be very easy.
For example 57 – 33 = 24.
Just subtract the tens and then subtract the units.
Imagine it like this if you like:
Key Points of this Lesson:
- For addition, just add the tens first, then add the units
- For subtraction, just subtract the tens and then the units