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WorksheetsO1C1 Estimation
Total questions: 10
Worksheet time: 9mins
Estimating is to....
find the exact answer
find something close to the correct answer
use an algorithm
When estimating 347+ 455 you should...
Round both numbers to the nearest ten and add them mentally (i.e. 350+460)
Line both numbers up and solve to find the answer
Round both numbers to the nearest hundred and add them mentally
Just do 300+400 and ignore the other numbers
Estimate my change.... I buy a $71 pair of runners, I give a $100 (2 x $50 notes) , my change will be about?
$171
$25
$20
$30
Estimate the cost.... I buy 3 pencils for $1.95 each.
3 x $2 = $6
3 x $1.50 = $3.50
Approximate... I ran 393m to my Grandpa's house, If i run back the total distance ran will be?
800m
600m
39.3m
750m
Ms. Stilson has a handful of goldfish crackers. You estimate how many she is holding using low high estimation. What numbers do you use? (Remember, you still want to try to be accurate)
0 is too low and 50 is too high
-10 is too low and 40 is too high
5 is too low and 30 is too high
0 is too low and 1000 is too high
Estimate the cost of 21 packs of screws each costing $2.90. ONLY round to the 10s place and type a dollar sign in before submitting! (i.e. $40, $50, $60, $70, $80)
(a)
James has worked out 31.5 × 49.6 and got the answer 156.24. Use estimation to check whether his answer is likely to be correct. Briefly explain if his answer is correct or not.
A box of matches contains 52 matches. Estimate the total number of matches in 8 boxes. Write your answer as a number rounded to the tens place (i.e. 290, 300, 310, 320, etc)
(a)
Rather than lining up subtraction problems, a more efficient way to subtract is to... (check all that apply)
Count up (i.e. 100-57 is 43 because 57+43 is 100)
Swap the numbers (i.e. 100-57 is the same as 57-100)
Subtract 5 at a time until you get your answer (i.e. 100-5-5-5-5-5-5-5-5-5-2 would be 100-57)
Round a difficult number (i.e. 57 can be estimated to be 60 as long as you subtract 3 from the end again)
