By Rebecca Wingard-Nelson
E-book through Wingard-Nelson, Rebecca
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Additional resources for Addition Made Easy
31 Partial P artial sums are used to add numbers in another way. Look at the problem 24 ϩ 37. 24 can be broken into 37 can be broken into tens 20 30 ones 4 7 Begin by adding only the ones. There are 4 ones and 7 ones. 4 ϩ 7 ϭ 11 The number 11 is called a partial sum because it is a part of the whole sum. Now add this partial sum (11) to the tens. 11 ϩ 20 ϩ 30 ϭ 61 So, 24 ϩ 37 ϭ 61 32 Sums Let’s try 1,316 ϩ 2,590. thousands hundreds tens 1,316 is broken into 2,590 is broken into Add the ones. Add the partial sum 6 to the tens.
35 Mental Y ou can use mental math to solve addition problems. One way to do this is to group numbers to make sets of ten. 8 4 2 6 ϩ7 8 ϩ 2 ϭ 10 4 ϩ 6 ϭ 10 There are 2 groups of ten. Remember: You can grou p the numbers in any order and it won’t chang e the answer. 2 tens ϩ 7, or 20 ϩ 7 = 27 So, 8 ϩ 4 ϩ 2 ϩ 6 ϩ 7ϭ 27 36 Addition You can also take from one of the numbers and give the same amount to another number without changing the final answer. Make 32 an even ten by taking 2 from the 32 and giving it to the 56.
Begin at 45 and count by fives. After 45 is 50, 55, 60. You have 60¢ so far. Now add the 6 pennies. Begin at 60 and count by ones. After 60 is 61, 62, 63, 64, 65, 66. You have a total of 66 cents. 39 Adding T o add time values, add minutes to minutes, and hours to hours. 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.