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Mrs Rae

Subtracting four-digit numbers with exchanges

Grades: 4th Grade, 3rd Grade, 5th Grade
Subjects: Math

Student Instructions

In this task, you will be subtracting two four-digit numbers. Some of the questions will need exchanges, some of them won’t. You need to use place value counters to represent what is happening when we exchange, then write it into the column method. TASK: Watch the video on the first slide to see an example that has been done for you. 1) Use move to drag the place value counters into the place value chart to represent your starting number 2) Take away the values that you need to (exchanging if you need to) 3) The counters that remain will be your answer. 4) Use label, pen or pencil to write the calculation in columns. 5) Starting with the ones, subtract up each column. Remember to show what you have exchanged! REMEMBER: if the number on the bottom is bigger than the number on the top you need to exchange from the column to the left (the larger column). For example, if you are subtracting in the ones column, you would need to exchange 1 ten from the tens column for 10 ones in the ones column.