Vocabulary
This property states that you can change the order of the numbers and still get the same sum
Commutative Property
Ten more than 345
355
Estimate. Round each number to the nearest tens
34 + 23 =
30 + 20 = 50
247 + 159 =
406
A golf ball has 336 dimples. How many dimples would two gold balls have?
Show your work!
336 + 336 = 672 dimples
A way of doing math in your head
Mental Math
One more than 5,645
5,646
Draw a model of the number 111
Teacher Draw
567 + 791
1,358
A horse weighs 1,723 lbs. A smaller horse weighs 902 lbs. How much do both horses weigh together?
Show your work!
1723 + 902 = 2625 lbs
When your answer makes sense it is
Reasonable
Name the number pattern shown below:
7, 13, 19, 25, 31
Add 6 each time
Estimate. Round each number to the nearest hundreds.
4,412 + 1,204 =
4400 + 1200 = 5600
777 + 886
1,663
Dwight drove 792 miles to Florida. He then drove back again. How many total miles did Dwight drive?
Show your work!
792 + 792 = 1584
This property states when you add zero to any number, the sum is that number
Identity Property
Complete the pattern
2,378; 2,478; 2,578; ___; ___; 2,878; 2,978
2,678; 2,778
Estimate. Round each addend to the greatest place value.
455 + 229
Find the answer.
500+ 200 = 700
1658 + 8949
10,607
Dory's farm has 468 apple trees and 224 pear trees. How many apples do they have all together? To the nearest ten? To the nearest hundred?
468 + 224 = 692
470 + 220 = 690
500 + 200 = 700
A number that is close to to its actual value is an
Estimate
A baby horse weighed 104 lbs at birth. It gained 100 lbs each month. How much will the horse weigh in 4 months? Write a number sentence to show your answer
104 + 100 + 100 + 100+ 100= 504
Solve 541 + 169 by drawing a math model (hundreds squares, tens rods, ones blocks)
Teacher Draw
9999 + 8877
18,876
There are two different mountains in the state of Washington that get record snowfall. One winter season, Mount Rainer received 1224 inches of snow. Mount Baker received 1140 inches of snow. What is the total snowfall of these two mountains? Is your answer reasonable? Estimate to show.
Two parts!
1224 + 1140 = 2364 inches
sample:
yes, 1200 + 1100 = 2300 close to 2364