Decimals - Complements to 1 - Worksheet

The worksheet from masterthecurriculum.co.uk is designed to enhance students' fluency and precision in working with decimals, specifically focusing on finding complements to 1. The exercise involves using a blank hundred square grid, where each small square is equivalent to one hundredth, to help visualise and calculate the missing decimal values that, when added to the given numbers, will total 1. For example, when given the decimal 0.35, students are tasked with determining the additional amount needed to make the sum equal to 1. In this case, the complement would be 0.65, as 0.35 + 0.65 equals 1.

The worksheet presents a series of decimal addition problems, where either the initial decimal or the complement is missing. Students are required to find the missing value that completes the equation to equal 1. Problems are presented in various formats, such as "0.25 + ____ = 1" or "1 = 0.75 + ____". This exercise not only helps students understand the concept of complements to 1 but also reinforces their understanding of decimal place value and addition. Additionally, the worksheet includes more challenging problems where the sums equal 2, pushing students to apply their knowledge in a slightly different context. The goal is to write as many correct missing number sentences as possible using the visual aid of the hundred square.