6. girls
in a
class
boys
in a
class
and = a class of boys
and girls
The set of boys and the set of girls form a new
set that is composed of all pupils in the class.
7. We use the plus sign
(+) to put together two or more
numbers.
8.
9.
10.
11. Steps in adding two-digit numbers
without regrouping:
1.Add the ones.
2.Add the tens.