Mental Math
Make a 10 or 100 to subtract mentally.
176 - 98 =
176 - 98 (+2) = 176 - 100 = 76
+2
78
Estimate. Round each number to the indicated place value.
58 - 34; tens
60 - 30= 30
Micheal picks 9,813 blueberries and then gives 4,736 to his grandmother. How many blueberries does he have left?
5,077 blueberries
169 - 54 =
115
Get up and do 5 jumping jacks, then get a drink of water. Finally, sit back down silently.
Yay!
Make a 10 or 100 to subtract mentally.
633 - 297 =
633 - 297 (+3) = 633 - 300 = 333
+3
336
Estimate. Round each number to the indicated place value.
675 - 492; tens
680 - 490 = 190
Peter plays jeopardy with his friends and earns 3,200 points. Maria earns double Peter's score, and Hank earns 700 less than Maria. How many points does Hank earn?
5,700 points
487 - 290 =
197
Write down what the vocabulary word difference means.
The answer to a subtraction problem.
Subtract mentally by breaking apart the smaller number.
295 - 144 =
295 - ( 100 + 40 + 4) = 151
Estimate. Round each number to the indicated place value.
7,432 - 5,704; hundreds
7,400 - 5,700 = 1,700
Lola and Lily baked 763 cupcakes to give to their family members. They gave 38 to their grandparents, 127 to their cousins and 78 to their aunts and uncles. How many cupcakes to they have left?
520 cupcakes
1,693 - 842 =
851
Create and solve your own 3 or 4 digit subtraction problem.
Answers will vary
Subtract mentally by breaking apart the smaller number.
1,068 - 756 =
1,068 - (700 + 50 + 6) = 312
Estimate.
4,967 - 3,012 =
Answers may vary
Margret's team scored 152 points at her last basketball game. Of those 152 points, Margret scored 68 of the points. How many points did the rest of the team score?
84 points
6,500 - 1,322 =
5,178
10,808 - 6,963 =
3,845
Make a 10 or 100 to subtract mentally.
2,579 - 831 =
1,748
Estimate.
908 - 762 =
Answers may vary
Lucas and his friends began collecting nuts at recess. Together, they collected 478 nuts. Then they gave 294 nuts to their friends in first grade. How many nuts are left?
184 nuts left
9,999 - 5,678 =
4,321
What does inverse operation mean?
t