Fact Families
Write the fact family for the following 3 numbers:
1, 2, 3
1 + 2 = 3
2 + 1 = 3
3 - 1 = 2
3 - 2 = 1
Subtract.
67 - 32
35
Estimate using rounding. Round to the highest place value.
49 - 25
20
This problem may contain an error. Determine if it is true or false.
42 - 27 = 15
True
Use a calculator to solve the following problem:
4829 - 203 =
4626
7, 8, 15
7 + 8 = 15
8 + 7 = 15
15 - 7 = 8
15 - 8 = 7
Subtract.
776 - 223
553
Estimate using rounding. Round to the highest place value.
195 - 105
100
464 - 93 = 431
False. Answer is 371
Use a calculator to solve the problem:
2749 - 293 =
2456
Write the fact family for the following numbers:
25, 50, 75
25 + 50 = 75
50 + 25 = 75
75 - 25 = 50
75 - 50 = 25
Subtract.
251 - 179
72
Estimate using quarter rounding. Round to the highest place value.
95 - 26
75
Determine if the answer is true or false.
819 - 427 = 392
True.
Use a calculator to solve the problem:
7942 - 139 =
7803
Write the fact family for the following three numbers:
25, 100, 125
25 + 100 = 125
100 + 25 = 125
125 - 25 = 100
125 - 100 = 25
Subtract.
4905 - 1896
3009
Estimate using quarter rounding.
455 - 127
325
Determine if the answer is true or false.
982 - 376 = 506
False. Answer is 606
Use a calculator to solve the problem:
2792 - 274 =
2518
Write the fact family for the following numbers:
250, 500, 750
250 + 500 = 750
500 + 250 = 750
750 - 250 = 500
750 - 500 = 250
6002 - 3995
2007
Estimate using quarter rounding.
4027 - 1995
2025
1839 - 890 = 949
True.
Use a calculator to solve the problem:
6738 - 2855 =
3883