add
subtract
round
Using place Value
solve
100
20 + 15
35
100
49-20
29
100
nearest 10 for 57
60
100

Use place value to help you:

254+610=

various possible answers

600+200+50+10+4=

100

35 skaters on the ice. 65 more skaters joined them. How many skaters in all?

35+65=100 100 skaters in all.

200
What is 60 + 50 ?
110
200
140 - 80
60
200
nearest 10 for 152
150
200

Matt says 77+43+69 is less than 300.  Is Matt correct? Why


Yes, because there are 3 numbers and each number is less than 100 so the sum must be less than 300.

200
95 butterflies in the meadow. 50 flew away. How many were left?
95-50=45 45 butterflies were left.
300
60 + ? = 105
45
300
80 - ? =27
53
300
nearest 10 for 477
480
300

Estimate the sum of 145 and 245

150+250=400

300

149 hockey cards in a tin. 50 fell out. How many were left in the tin?

149-50=99 99 were left in the tin.

400
What is 205 + 176 ?
381
400
675 -331
344
400
When do you round a number up to the nearest 10 ?
- when the ones digit is 5 or higher
400

Jen says 102+170+104 is less than 300 is Jen correct? Why or why not?

No, because each addend is more than 100 so the sum must be more than 300.

400

Estimate 439−162 by rounding to the nearest ten. Then find the difference.

440-160=280

439-162-277

500
What is 458 + 316 ?
774
500
991 - 135
856
500
When do you round a number down to the nearest 10 ?
- when the ones digit is 4 or less
500

What is the missing number for 782-155=

782-100=682

682-50=632

632-____=630

630-3=627


2

500

On their family vacation, the Lundy family drove 234 miles on Monday. They drove 354 more miles on Tuesday. How many total miles did the Lundy family drive on Monday and Tuesday?

354+234=588

588+234=822

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