Doubling 2, 4, and 8 Fact Sets Flashcards
This deck uses doubling to solve 4 and 8 facts. NOTICE in the answers that one side of an equation is cut in half and the other side is doubled.
4 x 3 =
double (2 x 3)
(2 x 3) + (2 x 3) = 12
OR
2 x 6 = 12
OR
6 + 6 = 12
4 x 4 =
double (2 x 4)
(2 x 4) + (2 x 4) = 16
OR
2 x 8 = 16
8 + 8 = 16
4 x 6 =
double (2 x 6)
(2 x 6) + (2 x 6) = 24
OR
2 x 12 = 24
OR
8 x 3 = 24
4 x 8 =
double (2 x 8)
(2 x 8) + (2 x 8) = 32
OR
2 x 16 = 32
OR
8 x 4 = 32
4 x 9 =
double (2 x 9)
(2 x 9) + (2 x 9) = 36
OR
2 x 18 = 36
OR
18 + 18 = 36
4 x 10 =
double (2 x 10)
(2 x 9) + (2 x 9) = 40
OR
2 x 20 = 40
OR
8 x 5 = 40
4 x 11 =
double (2 x 11)
(2 x 11) + (2 x 11) = 44
OR
2 x 22 = 44
OR
22 + 22 = 44
4 x 12 =
double (2 x 12)
(2 x 12) + (2 x 12) = 48
OR
2 x 24 = 48
OR
8 x 6 = 48
8 x 2 =
double (4 x 2)
(4 x 2) + (4 x 2) = 16
OR
4 x 4 = 16
OR
8 + 8 = 16
8 x 3 =
double (4 x 3)
(4 x 3) + (4 x 3) = 24
OR
4 x 6 = 24
OR
12 + 12 = 24
8 x 4 =
double (4 x 4)
(4 x 4) + (4 x 4) = 32
OR
8 x 8 = 32
OR
16 x 2 = 32
8 x 5 =
double (4 x 5)
(4 x 5) + (4 x 5) = 40
OR
4 x 10 = 40
OR
20 + 20 = 40
8 x 6 =
double (4 x 6)
(4 x 6) + (4 x 6) = 48
OR
4 x 12 = 48
OR
16 x 3 = 48
4 x 2 =
double (2 x 2)
(2 x 2) + (2 x 2) = 8
OR
2 x 4 = 8
OR
4 + 4
4 x 1 =
double (2 x 1)
(2 x 1) + (2 x 1) = 4
OR
2 x 2 = 4
OR
2 + 2
