Informal written methods for multiplication in Year 4 math typically include:
Repeated addition: this method involves adding a number to itself a certain number of times. For example, to find 4 x 3, we would add 4 + 4 + 4 = 12.
Arrays: this method involves arranging objects in a grid or array to help visualize the multiplication problem. For example, to find 4 x 3, we could create a 4 x 3 array of objects and count the total number of objects.
Skip counting: this method involves counting by a certain number a certain number of times. For example, to find 4 x 3, we would count 3, 6, 9, 12.
Multiplication tables: students can use the multiplication table to find the products of specific numbers.
Break apart method (Decomposition) this method involves breaking down a multiplication problem into smaller parts, and adding them up. For example, 4 x 3 = (4×2) + (4×1) = 8 + 4 = 12.
It’s important to note that these methods are not mutually exclusive, and students can use multiple methods to solve a problem, as well as to check their work and improve their understanding.