Estimate products

Learning Objectives Round a two-digit number to the nearest ten. Estimate the product of a one-digit number and a two-digit number by rounding. Use compatible numbers to estimate products. Solve word problems that require an estimated product. Explain that an estimate is a 'close enough' answer, not an exact one. Use multiplication facts with multiples of 10 (e.g., 4 x 50). Imagine you want to buy 7 packs of stickers, and each pack costs $29. Do you have enough money if you brought $250? 🛒 Let's learn a fast way to find out! In this lesson, we will learn how to estimate products. Estimating is like making a very smart guess in math. It helps you find an answer that is close to the real one, but much faster and easier to do in your head. Real-World Applicati...

TermDefinitionExample EstimateTo find an answer that is close to the exact answer. We often use the word 'about' when we estimate.About 20 + 30 is 50. The exact answer to 21 + 28 is 49. ProductThe answer you get when you multiply two or more numbers.In 4 x 5 = 20, the product is 20. RoundingChanging a number to a simpler, 'friendly' number that is close to the original number. We usually round to the nearest ten or hundred.The number 28 is close to 30, so we can round 28 to 30. Nearest TenThe multiple of ten (like 10, 20, 30) that a number is closest to.The number 52 is closest to 50. The number 58 is closest to 60. FactorA number that is multiplied by another number to find a product.In 7 x 3 = 21, the numbers 7 and 3 are the factors. Compatible NumbersNumbers that ar...

Rounding to the Nearest Ten 1. Look at the digit in the ones place. \n2. If the digit is 4 or less (0, 1, 2, 3, 4), the tens digit stays the same. \n3. If the digit is 5 or more (5, 6, 7, 8, 9), the tens digit goes up by one. Use this rule to make a number simpler before you multiply. This is the first step in estimating a product. Estimating a Product Estimated Product = (Factor 1) \times (Rounded Factor 2) To estimate a product, you change one of the factors into a simpler number by rounding it. Then, you multiply.