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Mental Math
Ballpark Estimates
+/- Problems
Measurement
Abbreviations
100
6+9+1
16
100
99 + 49 =
100 + 50 = 100
100
74 -29 =
45
100
How many inches are in a foot?
12 inches
100
What is the abbreviation for inches?
in.
200
19+2+28+11=
60
200
245+ 92
250 + 90= 340
200
96 - 37 =
59
200
How many inches are in one yard?
36 inches
200
What is the abbreviation for feet?
ft
300
21+3+0+6=
30
300
245 + 317 =
250 + 320=570
300
87 + 113 =
200
300
How many feet are in 1 yard?
3 feet
300
What is the abbreviation for yards?
yd
400
25+19+75=
119
400
366 + 208 =
370 + 210 = 580
400
172 + 209 =
281
400
How do you find perimeter?
Measure each side and add them up.
400
What is the abbreviation for millimeters?
mm
500
347-258=
89
500
769 + 445 =
770 + 450 = 1,220
500
271- 248 =
23
500
Name 2 units of length that belong to the U.S. Customary System.
foot, yard, mile, inch.
500
What is the abbreviation for centimeters?
cm