"Crossing Out" to solve subtraction problems
The procedure of "crossing-out"
is very helpful for teaching subtraction to early elementary students.
Crossing-out shows students how numbers become smaller in
subtraction while also giving them a strategy for easily solving
subtraction problems. It is very helpful with word problems as well,
which will be covered in upcoming skills.
Look at the subtraction number sentence below 5 - 4, but do not tell me
the answer right away.
What I want you to do is to tell me how many soccer balls you would cross-out to figure out the subtraction problem. Then tell me
how many soccer balls are left.
5 - 4 = ______