The rule of four

Maths

Fill in the gap: If two quantities are in the same ratio then there are _______ relationships I can use to find a missing value.

Lots of the same groups of yellow and red counters are put in a bag. Fill in the missing value in the ratio table.

Yellow and red counters are in the ratio 2 : 3. What fraction of the counters are yellow?

If a double number line starts with 4 on the top and 3 on the bottom, what will be the first number that appears both above and below the lines?

On a double number line, 10 is above the line and 40 is below the line. What is the constant of proportionality?

On a double number line, 4 is above the line and 4.8 is below the line. What is the constant of proportionality?

What is the missing number (indicated by the empty box) on this number line?

What is the constant of proportionality for this number line?