subtract bridge 10 8 -addition -fri-gr.4
TRANSCRIPT
Mental Math Strategy:
Subtraction Bridge 10-8 All AdditionGr. 4
160 - 80
=
20 + 40 =
130 - 90 =
30 + 50 =
100 - 80 =
70 - 60 =
60 + 80 =
170 - 80 =
100 - 70 =
30 - 20 =
110 - 80 =
70 + 70 =
90 - 90 =
80 + 90 =
140 - 90 =
180 - 80 =
90 + 90 =
50 - 20 =
110 - 90 =
100 - 40 =
70 + 90 =
90 - 80 =
120 - 90 =
70 + 80 =
150 - 80 =
160 - 90 =
40 + 60 =
80 - 80 =
30 + 40 =
180 - 90 =
150 - 90 =
60 + 70 =
140 - 80 =
20 - 20 =
50 + 70 =
100 - 90 =
50 - 40 =
80 + 80=
130 - 80 =
100 - 60 =
190 - 90 =
50 + 60 =
120 - 80 =
40 + 50 =
170 - 90 =
