Addition and subtraction - Subtract a one-digit number from a three-digit number crossing 10 - Worksheet

This worksheet is designed to help Year 6 students master the skill of subtracting a one-digit number from a three-digit number, particularly when this involves crossing a ten. The National Curriculum objective is to ensure students can confidently perform such subtractions with exchanges, also known as regrouping. To facilitate learning, differentiated worksheets and teaching slides are provided as resources. The key vocabulary for the lesson includes 'subtract', 'exchange', and 'regrouping'. Students are expected to understand the concept of exchanging in place value terms, recognizing, for example, that 321 can be seen as 3 hundreds, 2 tens, and 1 one, or alternatively as 3 hundreds, 1 ten, and 11 ones. Mastery of regrouping is crucial before attempting the subtraction exercises.

The worksheet presents various tasks to reinforce the subtraction technique, including using number lines and equipment to visualize the process. Students are prompted to explain their methods, encouraging a deeper understanding of the concepts involved. For instance, they are guided to see that subtracting 7 from 223 involves exchanging one ten for ten ones before performing the subtraction. The worksheet also challenges students with reasoning and problem-solving questions. They are asked to deduce the number of stickers Esin might have given away, ensuring the remaining number is odd, and to compare different methods for solving subtraction problems, like those of Malachi and Zach using Base 10. Answers are provided for self-assessment and to clarify the correct application of subtraction with exchanges.