Write at least three calculations that can be seen in the bar model. Work out the missing numbers. Write three additions that are equivalents to 283 + 850. 208,700 – 82,100 < 203,000 – ______ This worksheet is aimed at those working above age expected. Children solve missing number problems by comparing calculations. They need to understand that when two numbers are increased by the same amount the difference remains the same, and that the total of two numbers remains the same if one number