Dyvim
Bronze Knight of the Realm
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Unknowingly i used both methods in elementary school. Its good to know both ways, and by that i think of the memorized substraction 10-x=y as well as the adding up method.
You can be vey fast with not so easy substractions via the adding up method.
easier: harder:
1000 1013
-367 -367
____ _____
0633 0633+13 = 0646
pic unrelated:
You can be vey fast with not so easy substractions via the adding up method.
easier: harder:
1000 1013
-367 -367
____ _____
0633 0633+13 = 0646
pic unrelated: