By Rebecca Wingard-Nelson
E-book via Wingard-Nelson, Rebecca
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Extra info for Addition Made Easy
Carry the 1 to the hours column. Add hours. 1 2 hours 45 minutes ϩ 8 hours 20 minutes 5 minutes 1 2 hours 45 minutes ϩ 8 hours 20 minutes 11 hours 5 minutes The sum of 2 hours 45 minutes ϩ 8 hours 20 minutes is 11 hours 5 minutes. 41 Addition S ay you have six red shirts and five blue shirts. How many shirts do you have all together? The words “and” and “together” tell you that you should add the number of red shirts and the number of blue shirts. 6 red shirts ϩ 5 blue shirts ϭ 11 shirts Words that help you know how to solve problems are called key words.
2 hours 22 minutes ϩ 5 hours 10 minutes 7 hours 32 minutes The sum of 2 hours 22 minutes ϩ 5 hours 10 minutes is 7 hours 32 minutes. 40 Time Time values can be regrouped. 2 hours 45 minutes ϩ 8 hours 20 minutes Add minutes first. Since 65 minutes is more than 1 hour, regroup. 2 hours 45 minutes ϩ 8 hours 20 minutes 65 minutes 65 minutes ϭ 60 minutes ϩ 5 minutes. A group of 60 minutes can be regrouped as 1 hour. 60 minutes = 1 hour Write 5 minutes in the the minutes column. Carry the 1 to the hours column.
2 hours 22 minutes ϩ 5 hours 10 minutes Write the problem in columns. Line up matching units. 2 hours 22 minutes ϩ 5 hours 10 minutes Add minutes first. Add just as you would any two-digit number. 2 hours 22 minutes ϩ 5 hours 10 minutes 32 minutes Add hours. Add just as you would any one-digit number. 2 hours 22 minutes ϩ 5 hours 10 minutes 7 hours 32 minutes The sum of 2 hours 22 minutes ϩ 5 hours 10 minutes is 7 hours 32 minutes. 40 Time Time values can be regrouped. 2 hours 45 minutes ϩ 8 hours 20 minutes Add minutes first.