Number line
23+43
66
56+14
70
45+27
72
40 + 38
Estimate: 80
Actual Total: 78
Sally estimates that 12 + 72 will equal around 80. Is her estimate reasonable?
Yes, because it equals 84.
92+12
104
45+13
58
78+22
100
20 + 24
Estimate: 40
Actual Total: 44
Lila has 27 stickers. Her friend gives her 18 more. Later that day, her teacher gives her 25 more stickers for helping clean up.
How many stickers does Lila have now?
70 stickers
65+20
85
23 + 28
51
52+39
91
76 + 19
Estimate: 100
Actual Total: 95
Bob estimates that 33 + 54 will equal around 70. Is his estimate reasonable?
No, because the answer is 87.
78+10
76 + 22
98
23+46
69
23 + 26
Estimate: 50
Actual Total: 49
Mason has 16 toy cars. He buys 22 more at the store. Later, his brother gives him 15 more cars.
How many toy cars does Mason have now?
53 toy cars
45+44
89
87 + 13
12+76
88
43 +18
Estimate: 60
Actual Total: 61
The school library has 324 books on the shelves. The librarian buys 48 new books.
How many books does the library have now?
372 books