Mathematics 1 ESO – Unit 1  NATURAL NUMBERS     page 17 activity 89

a) Which of these numbers are natural numbers?

I) 2              IV) 1/2           VII)  6.4

II) 9             V) -8              VIII) 20

III) -5           VI) 8              IX)  √20

b) Mary earns 9 € per hour, John earns 8 € per hour and they work for 8 hours.

I) Calculate how much they earn together in 8 hours (remember to write the operations following the order of operations).

II) Calculate how much they earn together in 1 week (40 hours).

c) True or false?

I) All natural numbers are integers.

II) All integers are natural numbers.

III) A natural number can be greater than another.

IV) Number 523 has: five hundreds, two tens and three units.

V) The commutative property says that “it matters which number is first and which number is second”.

VI)  When there is a combination of operations, we don’t have to follow a hierarchy.