Decimal - Multiply Decimals by Integers - Presentation

In a series of engaging activities focused on multiplying decimals by integers, students are encouraged to utilise their understanding of place value to solve mathematical problems. The lesson begins with a discussion prompt that asks students to recall the process of exchanging when a place value column exceeds ten, and how this knowledge is applicable to multiplying decimals. The initial activities involve using place value counters to multiply specific decimal numbers by integers, such as multiplying 1.121 by 4, and then progressing to more complex examples like 2.203 multiplied by 3. These exercises are designed to visually reinforce the concept of decimal multiplication and ensure that students can complete the calculations accurately.

Further activities present real-world applications of multiplying decimals by integers, such as finding the total weight of multiple boxes of apples, marbles, sweets, and clothes. One scenario depicts a child named Esin who is saving money to buy a new phone, with her mother offering to quadruple any amount she saves. This practical example helps students to understand the significance of their mathematical skills in everyday contexts. To deepen understanding, reasoning exercises challenge students to evaluate statements about the outcomes of decimal multiplication and to fill in missing numbers in a sequence. The lesson concludes with independent work where students continue to practice multiplying decimals by integers, explaining their reasoning, and solving problems with the aid of place value charts and bar models.