Vocabulary
What do you call the answer to a subtraction problem?
Difference
289 - 139 =
150
Estimate. Round to the nearest 10. Then solve:
238 - 28 =
240 - 30 = 210
Make a ten to solve mentally. No stacking.
56 - 29 =
56 - 29 =
+1 +1
57 - 30 = 27
Olga has 329 toy cars. Nancy wants to borrow 117 cars. How many toys cars would Nancy have left?
212 toy cars
What does subtraction mean?
Taking a number away from another number.
786 - 127
659
Estimate. Round to the nearest 100. Then solve:
458 - 129 =
500 - 100 = 400
Make a ten to solve mentally. No stacking.
187 - 52
187 - 52 =
-2 -2
185 - 50 = 35
Samuel just bought 4,041 cookies for his birthday party. His guests eat 2,123 cookies. How many cookies does Samuel have left?
1,918 cookies
What are the two definitions for estimate?
To round or a number close to the exact value.
2,080 - 132
1,948
Estimate. Round to the indicated place value. Then solve:
149 - 109; tens
150 - 110 = 40
Make a 100 to solve mentally. No stacking.
1394 - 197 =
1,394 - 197 =
+3 +3
1,397 - 200 = 1,197
Jamie has 2,923 apples. Alec wants to buy 189 apples from Jamie. About how many apples would Jamie have left?
2,700 apples (if rounded to the nearest 100)
or
2,730 apples (if rounded to the nearest 10)
What are the 3 parts of a subtraction equation?
Minuend, subtraction, and difference.
4,000 - 1,243
2,757
Estimate. Round to the indicated place value. Then solve:
1,747 - 519; Hundreds
1,700 - 500 = 200
Make a 10 or 100 to solve mentally. No stacking.
6,392 - 289 =
6,392 - 289 =
+1 +1
6,393 - 290 =
Charlie's family drove 2,681 miles. Juan's family drove 2,149 miles. About how much more did Charlie's family drive?
600 miles (if rounded to the nearest 100)
or
530 miles (if rounded to the nearest 10)
What is inverse operation?
An operation that undos the opposite operation.
20,500 - 4,508
15,992
Estimate. Round to greatest place value. Then solve:
922 - 89 =
900 - 90 = 810
Make a 10 or 100 to solve mentally. No stacking.
3,601 - 1,498 =
3,601 - 1,498 =
+2 +2
3,603 - 1,500 = 2,103
Chantell has $2,331 dollars in the bank. She spent $289 on food this month. She spent $150 on gas this month. She also paid for rent, which was another $775. How much money does Chantell have left?
$1,117