Lucille Caron's Addition and Subtraction (Math Success) PDF

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)

Example text

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. Step 3: Find the answer. One way to solve a problem is to make an organized list. 48 Make an organized list of all the family numbers of 38. Family numbers are all the combinations of two numbers that will give you a certain sum. You are trying to find two numbers that will give a sum of 38 and a difference of 12. For your list, make the following columns: American League, National League, Sum, Difference, and Yes or No.

How many National and American League cards do you have? 49 23. Subtracting Time Values One of the basic mathematics needs of any society is a standard measurement of time. The calendar helps measure long periods of time. The clock helps measure short periods of time. There are 24 hours in one day but most clocks show twelve hours. The hands go around twice in 24 hours. M. M. M. using hours and minutes. M. using hours and minutes. M. hours. 24-hour time: 3 hours + 12 hours 45 minutes = 15 hours 45 minutes 24-hour time: 1545 Subtracting Time Values without Regrouping To subtract units of time, subtract the same units.

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. 2 Ϫ1 1 3 Ϫ2 1 4 Ϫ3 1 5 Ϫ4 1 6 Ϫ5 1 7 Ϫ6 1 8 Ϫ7 1 9 Ϫ8 1 When a number that is two less than a given number is subtracted, the difference is two.

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