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welcome this video looks at the mental mask strategy for subtraction called adjusting one number this is similar to our make a friendly number strategy for addition with this strategy we change one number within our subtraction problem to a friendly number this makes subtraction easier and eliminates the need to regroup lets look at the subtraction problem 271 minus 68 this problem asks me to find the difference between 271 and 68 for me this is a tricky problem because of the need to regroup in order to avoid regrouping I can adjust one number to a friendly number the number 68 is close to the friendly number 70 Ill add to making it 70 and eliminating the need to regroup now I can easily subtract 271 minus 70 thats two hundred 100 I subtracted two too many so Ill need to add back the two making my final answer 203 lets take a look at another problem 160 minus 41 this problem asks me to find the difference between 160 and 41 again this problem is tricky for me because of the need