Subtraction: Break Up 2 Numbers (Whole Numbers) . Concept/s in Focus: 👉 Subtraction is separating a total into parts or taking one part away from the total leaving a part (Total – Part = Part) 👉 Subtractions that require bridging of a place value have a number of that place in the part being subtracted which is larger than the number of that place in the total e.g. 54–27 requires bridging in the Ones place as there are not enough Ones to subtract 7 from 4. The Tens place value needs to be brid