Addition Made Easy by Rebecca Wingard-Nelson

By Rebecca Wingard-Nelson

Publication by way of Wingard-Nelson, Rebecca

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Sample text

921 rounded to the tens place is 920. 64 rounded to the tens place is 60. 920 ϩ 60 980 The estimated sum of 921 and 64 is 980. 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.

Regrouping for hundreds tens ones Y ou can regroup numbers in any place value. 4 9 6 Let’s look at regrouping in the tens place. 496 ϩ 213 496 ϩ 213 Write the numbers in columns. Line up the place values. 496 ϩ 213 9 Add the numbers in the ones column. 6 ϩ 3 ϭ 9. Write the 9 in the ones place. 1 496 ϩ 213 09 28 Add the numbers in the tens column. 9 ϩ 1 ϭ 10. Regroup 10. 10 tens is is the same as 1 hundred. Write the 0 in the tens place. Carry the 1 to the hundreds column. Three Digits 1 496 ϩ 213 709 Add the numbers in the hundreds column.

64 rounded to the tens place is 60. 920 ϩ 60 980 The estimated sum of 921 and 64 is 980. 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.

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