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Subtraction within 1,000
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636
-
239
=
?
402
396
397
399
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Hint
Can you answer 10 correctly?
636 less 239 is
?
-200
-30
-9
636
436
406
?
When subtracting numbers, it can be helpful to decompose the second number using the place value method and then use the arrow method to decrease the first number by each place value
For example, if we have 875 - 239
Decompose 239 into 2 hundreds, 3 tens, and 9 ones
Decrease 875 by -200 (=675)
Decrease 675 by -30 (=645)
Decrease 645 by -9 (=636)
Strategies:
Arrow Method
,
Break Apart
,
Compensation
,
Place-Value Chart