By Lucille Caron
E-book by means of Caron, Lucille, St Jacques, Philip M.
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Extra info for Addition and Subtraction (Math Success)
Check the answer to see if it is reasonable. Suppose you collect baseball cards and you have a total of 38 cards in your collection. You have 12 fewer National League baseball cards than American League cards. How many American League cards do you have? How many National League cards do you have? Step 1: What do you have to find? The number of American League cards and the number of National League cards. Step 2: Choose a method. Making an organized list is one strategy you can use to solve the problem.
2. Find the greatest common factor that appears in both numbers, and use this number to reduce the fraction. factors of 2: 1, 2 factors of 8: 1, 2, 4, 8 GCF = 2 Step 3: Reduce by dividing the numerator and denominator by the GCF. 2Ϭ2 1 ᎏᎏ ϭ ᎏᎏ 8 Ϭ2 4 greatest common factor (GCF)—The largest number that will evenly divide into a set of numbers. 58 Subtracting Unlike Fractions Unlike fractions are fractions with different denominators. To subtract unlike fractions, you need to change the fractions to like fractions with the same denominator.
The greatest place value is the hundreds place. Step 1: Arrange each number according to place value. 538 Ϫ64 Step 2: Round each number to the nearest hundreds. 538 rounds to 500 Ϫ64 rounds to Ϫ100 Step 3: Subtract. 500 Ϫ100 400 About 400 runners finished the race. estimation—An opinion or judgment; a best guess. 44 Rounding to the Nearest Tens Estimate again, this time rounding each number to the nearest tens. Estimate 538 Ϫ 64 Step 1: Arrange each number according to place value. Step 2: Round each number to the nearest tens.
Addition and Subtraction (Math Success) by Lucille Caron