Decimals - Bonds to 10 and 100 - Presentation

In a series of engaging activities, students are introduced to the concept of number bonds to 10 and 100, focusing on understanding how different combinations of numbers sum up to create these totals. The lesson begins with a discussion on what number bonds are and how they are useful in mathematics. Students are then encouraged to explore these bonds through hands-on activities using counters of different colours. They start by finding all possible combinations that add up to 10, such as 10 green counters and no blue counters, gradually exchanging green counters for blue ones until they reach 0 green counters and 10 blue counters, demonstrating that the sum remains constant at 10.

The lesson progresses to illustrate number bonds to 100, where students observe the partitioning of a square into 10 or 100 equal parts. They explore different scenarios, such as when Rosie shades a certain number of parts and determines how many are left unshaded, leading to the recognition of complementary pairs that add up to 10 or 100. Through these visual and interactive activities, students learn to write these relationships as addition equations. The lesson also introduces subtraction as a means to find missing number bonds to 100, offering a comprehensive understanding of how to work with number bonds in various mathematical contexts.