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[quote=Anonymous]I looked at that worksheet expecting to be horrified based on the comments here, but I didn't think it was that bad. 
A young student (around 1st or 2nd grade) won't necessarily have all of their addition and subtraction facts memorized, so they need a way of doing subtraction problems in their head. So they're taught to break the 'big' numbers into pieces, in this case chunks of 10. Most of us probably do this instinctively, but little kids need to be taught how to do it and then gradually it will become quick and natural to them. 
 
The worksheet literally just asks the kid to explain what the picture shows. Solve 13-7 by getting the numbers in groups of 10 and going from there:

Start with 13, in a group of 10 and and an 'extra' three in their own group. Take away (subtract) 3. Now you have 10. Take away (subtract) 4 more. You have subtracted 7 total, and the answer you have left is 6.

So 13-7= 13-3-4 = 6
The last answer choice is the correct answer.

I agree kids should memorize addition and subtraction facts, but they should also know how to break apart numbers to subtract if it's not one they've memorized.

For example, how would you guys solve 152 - 18 quickly in your head? Probably the way the worksheet described, just without explicitly thinking about what you were doing.[/quote]

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