WorksheetsEstimation and Computation N5.1
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Use front-end rounding to estimate the difference of:
7166 - 2998
7166 - 2998
a)
10 000
b)
5000
c)
7000
d)
4000
2.
Estimate to find which two numbers have a sum of ABOUT 10 000
a)
800 + 3950
b)
8010 + 1627
c)
8243 + 3000
d)
8847 + 200
3.
Estimate to find which two numbers have a difference of ABOUT 4000
a)
80 916 - 59 978
b)
10 832 - 2041
c)
92 439 - 81 899
d)
25 263 - 21 090
4.
Use front-end rounding to estimate the sum of:
590 322 + 473 990
590 322 + 473 990
a)
1 000 000
b)
600 000
c)
100 000
d)
900 000
5.
Which does NOT show using compatible numbers to estimate:
422 + 329
422 + 329
a)
500 + 300 = 800
b)
420 + 320 = 740
c)
420 + 330 = 750
d)
425 + 325 = 750
6.
Which shows using COMPENSATION to estimate:
5425 - 3931
5425 - 3931
a)
5000 - 3000 = 2000
b)
6000 - 4000 = 2000
c)
5400 - 3900 = 1500
d)
5000 - 4000 = 1000
7.
A student said that the estimated sum of 374 + 213 is 500. What estimation strategy do you think the student use?
a)
front-end rounding (300 + 200)
b)
compatible numbers (370 + 210)
c)
compensation (
8.
front-end estimation will always give an
a)
overestimate
b)
underestimate
c)
exact answer
9.
Compatible numbers estimation can give
a)
overestimate
b)
underestimate
c)
either an overestimate or underestimate depending on the chosen numbers
10.
The estimated sum is 7000 . What might have the original numbers been?
a)
5839 + 1219
b)
4399 + 4921
c)
6809 + 3061
d)
5201 + 1327
100 %
