Mental Math - Math Worksheet With Answers

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Mental Math

You can use this math trick to multiply two-digit numbers mentally. Break apart one factor and

multiply to find each product. Then add.

Here is how you can use mental multiplication to find 23

35.

First, break apart the first factor so that one part is a multiple of 10.

(20

35)

(

35)

Then multiply to find each product.

Finally, add the products.

Suppose the order of the factors was changed to 35

23. Would it be easier or

harder to multiply mentally? Try it.

Analyze Is there a different way you could have found the product of 23

35? Explain.

Multiply mentally.

Extend It Make up two multiplication problems with two-digit factors. Use each of

these four digits exactly once: 1, 3, 2, 5. One problem should be easy to solve mentally,

and one should be more difficult. Solve your problems. Explain why one is more

difficult to solve mentally than the other.

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