Define
What is a addend?
A number you add.
Round 790 to the nearest 100
800
300 + 42 =
342
89 - 9 =
80
What is the value of 3 in the number below?
836
The value is 30
Because it is in the tens place.
What is the sum?
The answer to an addition problem.
Round 76 to the nearest 10
80
800 + 100 =
900
143 - 43 =
100
Last Friday, 413 students bought lunch. By the end of the day on Wednesday, only 128 students ordered lunch. About how many more students ordered lunch on Friday than on Wednesday?
413 - 128 =285 Students
What is the identity property of addition?
678 + 0 = 678
Round 532 to the nearest 100
500
251 + 89 =
340
748 - 583 =
165
Mr. Cruz bought 65 holidays pencils for Heights. Mrs. Maleganos bought 115 holidays pencils for Harbor Hill. How many more pencils did Mrs. Maleganos buy than Mr. Cruz?
115 - 65 = 50 pencils
What is the commutative property of addition?
The switcheroo property.
You can add numbers in any order and still get the same sum.
1 + 2 = 3
or
2 + 1 = 3
Round 827 to the nearest 10
830
512 + 450 =
962
379 - 299 =
80
On Sunday, there 150 bike riders in the park. Then, on Monday there were 65 bike riders at the park. How many total bike riders were at the park on both Sunday and Monday?
150 + 65 = 215 bike riders
What is the associative property of addition?
When three or more numbers are added, any two or more can be grouped together and you will get the same sum (answer).
(3 + 7) + 9 = 3 + (7 + 9 )
The same numbers grouped together in a different order, you still get the same sum.
Round 562 to the nearest 10
560
541 + 239 =
780
1,732 - 651 =
1,081
An explorer discovered 275 jewels sparkling in a cave. Of the jewels, 63 were rubies, 152 were crystals and the rest were diamonds. How many diamonds did the explorer find in the cave?
1. 152 + 63= 215
2. 275 - 215= 60
60 diamonds