 By Rebecca Wingard-Nelson

ISBN-10: 076602508X

ISBN-13: 9780766025080

Ebook by way of Wingard-Nelson, Rebecca

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Example text

The digit 2 is less than 5, so 329 is closer to 300 than to 400. 329 rounds down to 300. 34 550 600 650 700 674 674 has a 7 in the tens place. The digit 7 is greater than 5, so 674 is closer to 700 than to 600. 674 rounds up to 700. Estimate Estimate 329 ϩ 674. 329 rounds to 300. 674 rounds to 700. estimate—An answer that is not exact; a reasonable guess. 300 ϩ 700 1,000 The estimated sum of 329 and 674 is 1,000. What do you do if the two numbers you are adding have different numbers of digits?

Dime = 10¢ nickel = 5¢ penny = 1¢ 10¢ + 5¢ + 1¢ = 16¢ You have 16 cents in all. Quarters have a value of 25¢. It is easier to add money if you memorize the value of up to four quarters. 25¢ 38 50¢ 75¢ 100¢ Money Coin values can be added quickly by counting. Count by tens for dimes, fives for nickels, and ones for pennies. If you have 1 quarter, 2 dimes, 3 nickels, and 6 pennies, how many cents do you have in all? Add the quarters first. One quarter is 25¢. Now add the 2 dimes. Begin at 25¢ and count up by tens.

If it is less than 5, round down. 300 350 400 450 500 329 329 has a 2 in the tens place. The digit 2 is less than 5, so 329 is closer to 300 than to 400. 329 rounds down to 300. 34 550 600 650 700 674 674 has a 7 in the tens place. The digit 7 is greater than 5, so 674 is closer to 700 than to 600. 674 rounds up to 700. Estimate Estimate 329 ϩ 674. 329 rounds to 300. 674 rounds to 700. estimate—An answer that is not exact; a reasonable guess. 300 ϩ 700 1,000 The estimated sum of 329 and 674 is 1,000.