When multiplying by 10 in our heads, we can move each number a place value column to the left and add a zero. 6 x 40 is equal to 6 x 4 x 10 6 x 4 is equal to 6 x 2 x 2 6 x 2 x 2 = 24 24 x 10 = 240 ...

When multiplying by 10 in our heads, we can move each number a place value column to the left and add a zero. 6 x 40 is equal to 6 x 4 x 10 6 x 4 is equal to 6 x 2 x 2 6 x 2 x 2 = 24 24 x 10 = 240 ...