Skill 3A
"Crossing Out" to solve subtraction problems
The procedure of "crossingout"
is very helpful for teaching subtraction to early elementary students.
Crossingout 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 crossout to figure out the subtraction problem. Then tell me
how many soccer balls are left.
5  4 = ______
