Question

1. Estimate the following sums using the general rule.
2.989 - 796
b. 24.196 - 19.204 c. 1012 + 5040 +4190
2. Estimate the following differences using the general rule.
h 89.189 - 85.817 c. 4589 - 116 - 3694
103​

Answer 1

1.

2. 989-796

Rounding of to nearest hundred

=1000-800

= 200

b. 24.196-19.204

= 24196-19204

Rounding of to nearest hundred

=24000-19000

=5000

c. 1012+5040+4190

Rounding of to nearest hundred

= 1000+5000+4000

=10000

2.

h. 89.817-85.817

=89817-85817

Rounding of to nearest hundred

= 90000-90000

=0

c.4589-116-3694-103

Rounding of to nearest hundred

= 4600-100-4000-100

400