Then do these practice problems on a whiteboard:
4 + 4 = 6 + 6 = 8 + 8 = 9 + 9 = 3 + 3 = 7 + 7 = 5 + 5 =
14 - 7 = 10 - 5 = 20 - 10 = 16 - 8 = 12 - 6 = 18 - 9 = 8 - 4 =
14 - 8 = 12 - 7 = 20 - 11 = 16 - 9 = 10 - 6 = 18 - 10 = 14 - 8 =
15 - 7 = 13 - 6 = 20 - 9 = 17 - 8 = 13 - 6 = 18 - 8 = 16 - 8 =
HOMEWORK: Write a comment. Tell how a double fact helped you solve two of the yellow subtraction equations.
IT WILL LOOK LIKE:
"I knew the double fact ___ + ___ = ___, so I thought _____." "First I did _______, then I did _______."
i knew the double fact for 20 -11
ReplyDeleteits 9 all you have to do is well
this the way i do it i do 11 plus
9 then you get 20 there you go so
thats how i do my math
7 +7 = 14 so I knew 14-8 would be one less because 8 is one more than 7.
ReplyDelete16 - 8 = 8 I knew 8 + 8 = 16.
A
I knew the double fact 10-6=4 so I thought double adding. First I did the double stragity, then I did the double double stratigy.
ReplyDeletehave a great day!!!!!!!
ReplyDeletei knew the double fact to 7+7 14 and then 14-8=6 because it's eight is mode seven
ReplyDeleteTHANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ReplyDelete