Remembering how to count by 10's can help us when we need to multiply by 10.
Complete the pattern by adding 10 each time.
20,⬚,40, ⬚, ⬚
When adding 10 each time in the pattern, the units digit does not change and the tens digit increases by 1.
Let's look at how to multiply numbers by 10.
Find the value of 10\times 4.
A quick way to multiply any whole number by 10 is to add a 0 at the end.
That moves all our numbers up one place in the place value table, with the 0 as a place holder in the units column.
However, this rule is ONLY true for whole numbers, so you have to be careful once fractions or decimals are involved.
uses mental and informal written strategies for multiplication and division