Silver Questions
Wednesday
~Subtraction~
10
+
10
=
20
9
+
?
=
20
EXAMPLE
If...
-1
+1
+
=
20
+
20
=
40
?
+
?
=
40
If...
+
=
51
-
26
=
25
50
-
25
=
25
Because...
-1
-1
41
-
21
=
?
-
=
Because...
-1
-1
101
-
51
=
?
-
=
Because...
-1
-1
Extra problems (show your working in your maths book).
91 - 46 = ? because...
69 - 34 = ? because...
99 - 49 = ? because…
59 - 29 = ? because...