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What Is Near Doubles In 2nd Grade Math, And "Make A Ten"?

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Jason Schwarzmann Profile
The 'Make A Ten' Strategy is a simple yet effective, easy to remember system for working out multiplication in mental arithmetic circumstance. We will give a brief detailing below (and it will be brief, as it's so easy to do!), using the sum '89 + 24' -

First, you must change one number to a multiple of ten. 89 is the number already closest to a multiple of ten, so we will add 1 to it to make it to 90.

Now you must adjust the other number in the OPPOSITE manner. Because we added 1 to 89, we must SUBTRACT 1 from 24, to make it 23.

Now, it is much easier to work out 90 + 24, than it is to work out 89 + 24.

The answer to both of these sums is 113.

The correct answer is: 113.
Anonymous Profile
Anonymous answered
"Near doubles" are 2 consecutive numbers. For example: 2 and 3, 7 and 8, 11 and 12.  Therefore, 4 + 5 are near doubles.
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Anonymous answered
'Near doubles' are simply numbers that are nearly the same as another. For example, 3 and 4 are  'near doubles' because 3 is nearly a double of 4!
Brandy Lawless Profile
Brandy Lawless answered
Near doubles - A strategy derived from the "doubles addition facts." For example, a child might solve 3 + 4 by noting that 3 + 3 = 6, so 3 + 4 must be 1 more than 6, or 7.
Anonymous Profile
Anonymous answered
How would I explain make 10 to someone  who had never heard of it? How would I show it?
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Anonymous answered
I have won 8 chess matches on Mon.  Tues. I won 5 matches. Complete the two addition sentences to show how many games I won on mon. And tues.

8+___=___
10+___=___

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