Adding and Subtracting Whole Numbers
20+38
58
A shape with four equal sides, and all right angles.
74 to the nearest tens
70
2, 4, 6, 8, 10...
Start at 2 and add 2 each time
2 x 7
51+28
79
A quadrilateral with two pairs of parallel and equal sides.
Parallelogram
146 to the nearest hundreds
100
10, 20, 30, 40, 50...
Start at 10 and add 10 each time
10/2
5
47+33
80
A parallellogram with four equal sides (but not all right angles)
Rhombus
179 to the nearest tens
180
84, 81, 78, 75, 72..
Start at 84 and subtract 3 each time
6 x 10
60
29+63
92
A quadrilateral that has two parallel sides.
Trapezoid
2400
114, 107, 100, 93, 86...
Start at 114 and subtract 7 each time
18/3
6
165+36
201
A quadrilateral with two pairs of connected equal sides.
Kite
3894 to the nearest thousands
4000
68, 79, 90, 101, 112...
Start at 68 and add 11 each time
9x6
54