KS2 Primary Maths Age 9-13 - Multiplication with missing digits: - Explained

The video tutorial guides viewers through solving a multiplication problem where three numbers multiply to 385. The teacher begins by identifying 5 as a factor of 385, then divides 385 by 5 to get 77. The teacher further breaks down 77 into its factor pairs, 7 and 11, explaining the reasoning behind each step. The tutorial concludes with a discussion on alternative solutions and emphasizes the importance of understanding factorization.

What is the first step in finding the factors of 385?

• Check if 385 is divisible by 11

• Check if 385 is divisible by 3

• Check if 385 is divisible by 5

• Check if 385 is divisible by 7

After dividing 385 by 5, what number do we need to factor next?

• 35

• 77

• 11

• 7

Which of the following is a factor pair of 77?

• 5 and 15

• 7 and 11

• 9 and 8

• 3 and 25

What is one alternative method mentioned for finding factors of 385?

• Using 385 * 1 * 1

• Using 385 * 2 * 2

• Using 385 * 3 * 3

• Using 385 * 4 * 4

What is the main reason for choosing the factors 5, 7, and 11?

• They are the only factors of 385

• They are the smallest factors

• They are the simplest factors to find

• They are the largest factors