Addition
256+123
379
745-123
622
Round 12 to the nearest 10
10
Round 12 to the nearest 100
0
There are 88 markers in a bag. Five students each take 7 markers from the bag. The number of pencils left in the bag is n.
Write an equation that represents the situation.
88-5x7=n
419+393
812
548-424
124
Round 43 to the nearest 10
40
Round 657 to the nearest 100
700
There are seats for 400 students in the auditorium. There are 187 students from Clare's school and 129 students from Noah's school at the performance.
a. Noah estimates that there will be about 100 empty seats. Do you agree with Noah?
Explain or show your reasoning.
Yes explanations may vary
724+197
921
842-328
514
Round 65 to the nearest 10
70
Round 712 to the nearest 100
700
There are seats for 400 students in the auditorium. There are 187 students from Clare's school and 129 students from Noah's school at the performance.
b. Do you think there will be more or less than 100 empty seats? Explain or show your reasoning.
Less than 100
799+112
911
600-123
477
Round 124 to the nearest 10
120
Round 123 to the nearest 100
100
There are 245 grapes at the store. John bought 85 and Stan bought 67. About how many grapes are left at the store?
About 40 grapes
597+325
922
800-499
301
Round 455 to the nearest 10
460
Round 555 to the nearest 100
600
There are seats for 400 students in the auditorium. There are 187 students from Clare's school and 129 students from Noah's school at the performance.
c. How many empty seats will there be? Explain or show your reasoning.
84 seats will be left