Multiplying by 2-digit numbers means finding the product when one factor has two digits (like 24 or 57). This builds on your knowledge of basic multiplication facts and place value.
In real life, we often multiply by 2-digit numbers when calculating costs, measurements, or quantities of items.
The standard algorithm is a step-by-step method that uses place value to multiply larger numbers efficiently.
Remember to align numbers by place value when writing partial products. The zero in the second line represents the tens place.
Word problems require you to identify when multiplication is needed and then apply the standard algorithm to find the solution.
Always check if your answer makes sense. If a factory makes 28 toys each hour, in 15 hours it should make more than 280 toys (10 hours) but less than 600 toys (20 hours).
Estimation helps verify that your multiplication answer is reasonable before you finish solving the problem.
If your actual answer is very different from your estimate, check your work again. You might have made a calculation error.
Being aware of common errors helps you check your work more carefully.
Always double-check your multiplication facts and addition. Working neatly with proper alignment helps prevent errors.