A multiple of ten is any number you get when you multiply ten by a whole number. These numbers end in a zero.
You can easily spot a multiple of ten because it always has at least one zero in the ones place.
When you multiply a number by a multiple of ten, you first multiply the non-zero parts. Then, you add the total number of zeros from both factors to the end of the product.
Think of it as "how many groups of tens" you have. For example, 14 × 30 is like 14 groups of 30, or 14 × 3 groups of 10.
When both numbers have two digits, and one is a multiple of ten, use place value. Break the problem into simpler multiplication facts you already know.
You can also reverse the factors. For example, 25 × 60 will give you the same answer because multiplication is commutative.
You can use the same strategy no matter which number is the multiple of ten. The key is to focus on the basic fact first, then count and add the zeros.
Always check your final answer. Does it have the correct number of zeros? Does the number of digits make sense for the size of the numbers you multiplied?
Multiplying by multiples of ten is a useful skill for solving real-world problems, like calculating total items in multiple packages or finding distances.
When you see a problem with a number ending in zero, it’s a signal that this efficient strategy can be used.