Scientists believe stingrays and zebra mbuna fish can do simple maths involving addition and subtraction of numbers between one and five. It follows a study at the University of Bonn, in Germany, ...

Write the numbers in a vertical list, lining up the decimal points. If the numbers have a different amount of digits, there may be some gaps in the columns. Fill in any gaps with a zero so that each ...

To add -4 and 5, draw the starting number on a number line and count to the right when adding numbers. What is the difference in temperature between a desert at 40 °C and a mountain top at -2 °C? \(40 ...