Vocab
What is an estimate?
36-19
What is 17?
93 rounded to the nearest ten is?
Use the break apart strategy:
452+ 223=
What is 400+50+2
200+20+3
600+70+5
675
Rylan said that 435 rounded to the nearest hundred would be 500. What is his error?
The answer should be 400 because you round down if it's 4 or less in the tens place when rounding to the nearest hundred.
You can ___________ a number to the nearest ten or hundred to find a number that tells about how much or about how many.
What is round?
72-25
What is 47?
136 rounded to the nearest 10.
What is 140?
Use rounding to estimate this sum
93+ 26
What is 90+30= 120?
Rob collected 30 rocks on Friday. On Saturday he collected 17 rocks. About how many rocks did he collect on Friday and Saturday?
What is 50 rocks?
The ________ Property of Addition states that you can add two or more numbers in any order and get the same sum.
What is Commutative?
230-179
What is 51?
234 rounded to the nearest hundred?
What is 200?
Estimate the difference of 135- 65
What is 140-70= 70?
806 people attended the concert on Saturday. 325 people attended the concert in the morning. How many people attended the concert in the evening?
What is 481?
Numbers that are easy to computer mentally.
What are compatible numbers?
746-498
What is 248?
587 rounded to the nearest hundred.
What is 600?
Use the number line strategy to figure out
23+ 17
What is start at 23 add 1 set of 10 to get 33 then add 7 ones to get 40?
Evelyn sold 90 tickets, Jay sold 23 less than Evelyn. How many tickets did Jay and Evelyn sell altogether?
what is 157?
The ____________ Property of Addition states that the sum of any number and zero is that number.
What is Identity?
230-400
Can't regroup, negative number.
562+230 to the nearest hundred.
What is 800?
Use place value to solve
641-268
check your answer with addition
What is 373?
373+268=641
Give me four numbers that 450 could be rounded to.
What are 446, 447, 448, 449, 551, 552, 553, 554?