By Lucille Caron
E-book by means of Caron, Lucille, St Jacques, Philip M.
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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. 7. Find out which countries use which system. Are there other ways in which decimals are written?
Arrange them underneath each other. Subtract from right to left, starting with the smallest unit. Calendars measure long periods of time. Clocks measure short periods of time. 50 Subtract 6 hours 55 minutes Ϫ 2 hours 20 minutes Step 1: Subtract minutes. 6 hours 55 minutes Ϫ2 hours 20 minutes 35 minutes Step 2: Subtract hours. 6 hours 55 minutes Ϫ2 hours 20 minutes 4 hours 35 minutes Subtracting Time with Regrouping Subtract 7 hours 18 minutes Ϫ 4 hours 45 minutes 6 Step 1: Regroup 1 hour for 60 minutes.
Subtraction of one-digit numbers includes basic subtraction facts. Basic subtraction facts include all possible combinations of one-digit whole numbers subtracted from one-digit whole numbers. Here are some of the basic subtraction facts. When a number is subtracted from itself, the difference is zero. 0 1 2 3 4 5 6 7 8 9 Ϫ0 Ϫ1 Ϫ2 Ϫ3 Ϫ4 Ϫ5 Ϫ6 Ϫ7 Ϫ8 Ϫ9 0 0 0 0 0 0 0 0 0 0 When zero is subtracted from a number, the difference is that number. 1 Ϫ0 1 2 Ϫ0 2 3 Ϫ0 3 4 Ϫ0 4 5 Ϫ0 5 6 Ϫ0 6 7 Ϫ0 7 8 Ϫ0 8 9 Ϫ0 9 When a number that is one less than a given number is subtracted, the difference is one.