By Lucille Caron
E-book via Caron, Lucille, St Jacques, Philip M.
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Additional info for Addition and Subtraction (Math Success)
Opposite of Ϫ8 is 8 Step 3: Change subtraction to addition. 7ϩ8 Step 4: Add. 7 ϩ 8 ϭ 15 Record the highest and lowest temperatures for one week. What is the difference between them? 57 27. Subtracting Fractions Look at a window. How is it divided? Is it divided into 4, 6, or 8 equal parts, or panes? Suppose your kitchen window is divided 1 2 1 into 4 equal panes. One pane is ᎏᎏ; 2 panes are ᎏᎏ or ᎏᎏ; 3 panes 4 4 2 3 4 are ᎏᎏ; and 4 panes are ᎏᎏ or 1 window. ” A fraction shows a relationship between a part and the whole item.
Add zeros when necessary as placeholders. 87 Step 1: Line up the decimal points. Add zeros as needed. 5 . 6 0 Ϫ0 . 8 7 Step 2: Regroup 1 tenth for 10 hundredths. Subtract hundredths. 5 . 6 0 Ϫ0 . 8 7 3 5 10 4 Step 3: Regroup 1 one for 10 tenths (10 ϩ 5 ϭ 15 tenths). Subtract tenths. 4 Step 4: Place the decimal point in the difference. Subtract ones. 15 10 5 . 6 0 Ϫ0 . 8 7 7 3 15 10 5 . 6 0 Ϫ0 . 8 7 4 . 7 3 I can do this! In some countries a comma is used instead of a decimal point. For example, the number nine and seven tenths would be written as 9,7.
To add two positive numbers, write them with or without the positive sign. 2 ϩ 5 ϭ 7, or ϩ 7 0 1 2 3 4 5 6 7 8 The sum of two or more positive integers is always positive. You can add two negative numbers: 2 ϩ Ϫ3 ϭ Ϫ5 Ϫ – 6 – 5 – 4 – 3 – 2 – 1 0 1 2 The sum of two or more negative integers is always negative. integers—All the whole numbers and their opposites (negatives). 28 Adding Unlike Integers Add 2 ϩ Ϫ5 Use white circles to represent positive integers and black circles to represent negative integers.
Addition and Subtraction (Math Success) by Lucille Caron