First students should be taught to count numbers and make links between the numbers. Then they should learn to identify and create different representation of numbers and learn the concept of zero.
read and write numbers and to count, sort and order them. That way they can compare the size of two sets. And than students should be taught to add and subtract numbers. Adding can be learned by grouping numbers, while subtracting by moving apart given numbers.
You need to find out how much it costs to wash one car, so:
3×=13.50
Divide both sides by 3.
x=4.5 per car.
Now multiply 4.5 by 25 which should give you $112.50
Answer:
D: -35
Step-by-step explanation:
Take the sign of the larger which is negative.
subtract 99-64 to get 35.
Add your negative sign to get -35.
