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4-digit number addition and subtraction addition equation basic principles bottles of 100 change the grouping digits division algorithm division equation exer find quotients Find the difference find the quotient Find the sum finding a missing fours were subtracted Give the missing given number grouping principle help the children help you find help you understand helps to think Inequalities know that 48 largest 2-digit number less bottle lesson m m m m m m missing addends missing factors missing numbers multiplication equation multiplication-addition principle number line pairs of equations Place value provide additional experiences provide experiences PURPOSE relationship between multiplication Repeated subtraction Sets help sixes Solve the equations stress the relationship subtraction equations sure the children tens tens tens thinking about missing threes were subtracted write a division Write a multiplication Write a number Write an addition Write the equation Write the missing write the quotient