$mental math practice game$

Multiplying by 4 can be seen as multiplying by 2 twice, multiplying by 12 is the same as multiplying by 3 and then 4. We can replace a number with its factors (product of smaller factors) and multiply in stages. This strategy works well for estimating and it is based on the distributive property of multiplication over addition. Then we add the partial products to get the final product. For example, we multiply the 100s before the tens and the 10s before the ones. A variation of this method is the front-end multiplication where we multiply the biggest quantity first.

$mental math practice game$

This strategy is the foundation of the standard multiplication algorithm and it is taught usually in grade 3. Splitting or multiplying in parts and front-end multiplication. We can pair together numbers that are easier to multiply, or that give us multiples of 10 as products. Grouping/Pairing-Using the associative property To multiply by 25 multiply by 100 and divide by 4. For example,e to multiply by 50 multiply by 100, and divide by 2. Knowing the factors of 1 will help students apply strategies such as multiplying in stages and clustering (more about these strategies below) 2×50=100, 4×25=100, 5×20=100, 8×125=1000, and so on. Combined with other strategies works well for solving complicated problems. Working with base 10 blocks will help students see how when a number is multiplied by 10 the ones become 10s the tens become 100s and so on. Students need to conceptually understand why this strategy works. When multiplying by 4 we can double the number twice and when multiplying by 8 we can double the number thrice. Multiplying a number by 5 is the same as multiplying its half by 10. This strategy comes in handy when multiplying greater numbers as well. same way, when multiplying by 11 we can multiply by 10 and add one for each 11 multiplied. When multiplying by 9s we can multiply by 10s and subtract one for each nine multiplied. The visual above shows this strategy that makes one of the most tricky multiplication tables easy to figure out quick. Ask questions like: Which mental math strategy is for this problem? Why? I always include mental math strategies in math talks and I find that it helps the students see beyond the algorithm and look for relations in numbers.īelow are some mental math strategies that will make solving problems more fun and more interesting and will expand students’ skills and improve their mental multiplication skills. Introduce strategies through math talks and apply them to more problems. Discuss the different solutions and find the connections. Can we do it mentally? Present a solution and ask them to explain. Present a problem and ask students how to solve it. Mental Math strategies make great math talks. Use examples with small numbers before you move to greater numbers. Use base 10 blocks, beads on strings, and other manipulatives to make sure that your students understand the strategies. Using visuals and manipulatives reinforces the strategies and helps all students gain a deep understanding. Multiplication Mission – arrays, properties, multiples, factors, division Visuals and Manipulatives Multiplication and its properties (Building Arrays with Bricks) Perfect for students, professionals, brain training, or just for fun, FastMath offers a wide variety of exercise types, number types, and difficulty levels to improve your math skills.Below are some resources that help students practice properties when they start with multiplication and arrays. FastMath will turn you into a math genius in no time! It's the ultimate way to master solving math problems quickly in your head.

Mental math practice game