a number close to the exact number
What is an estimate?
79 rounded to the nearest 10
What is 80?
124+335=
What is 459?
1,234+3,423=
What is 4,657?
these symbols show grouping (DO THIS FIRST!)
What is parentheses?
189 rounded to the nearest 10
What is 190?
473+244=
What is 717?
4,876+2,324=
What is 7,200?
this property states that the sum of any number and zero is the number
What is the identity property (of addition)?
354 rounded to the nearest 100
What is 400?
889+124= Round the sum to the nearest 100.
What is 1,013? Rounded to the nearest hundred, 1,000.
this property states that the order in which numbers are added does not change the sum
What is the commutative property (of addition)?
7,864 rounded to the nearest 100
What is 7,900?
Omar has 654 pieces of Halloween candy and Olivia has 299 piece of candy. If they put their candy together, how much do they have? Write an addition sentence with an unknown. Make an estimate (by rounding to the nearest 10). Then solve.
What is 654+299=X, a reasonable estimate would be 950, the sum is 953?
this property states that the way addends are grouped does not change the sum
What is the associative property (of addition)?
which is greater, 3,264 rounded to the nearest 10 OR 3,264 rounded to the nearest 100
What is 3,264 rounded to the nearest 100?
Spencer covered 182 miles trick-or-treating and Amiee covered 199 miles. It's reasonable to say that they covered about a total of 400 miles on October 31. (True or false, defend with evidence)
What is TRUE? 182 is about 200, 199 is about 200. 200 + 200=400