Skeels 2nd gr Mrs. Harrison
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Week 1 rule:
Adding 0 and 1
10 seconds for each problem. Use flash cards at home that work with this rule. Grades are taken on the last day of school for the week.
Ten rules for addition:
1. zero plus rule:
Any number added to zero is that
one plus rule: Any number
added to one is the next counting
two plus rule: Any
number added to 2 is the next even number or odd number depending on which one
you started with.
doubles rule: you need to memorize the
doubles plus one: When
adding two numbers in counting order double the lesser and add
6. shared doubles:
When adding number that are in order but one is missing, double the middle
number example: 4+6=
5 is missing in that counting order so double the 5
tens rule: you need to
memorize the combinations of 10
tens plus rule: when adding 10 to any number just add one number to the
tens column and leave the ones alone.
9. nines rule: since you know your 10 plus, when
adding 9 think ten plus and then subtract
the rest of the fact families;
there are very few left 3+6, 4+8, 5+8, 7+4, 8+3,
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