Name:
Std.:VII
Date:
Subject: Mathematics
Classroom Organization: Individual
Topic: Place value, ordering and rounding
Answer Scheme
Q.1 Workout the following multiplications.
a) 3.215 ×10−2
b) 4.0 ×103
0.03215
4000
d) 1.829 ×104
c) 9.4 ×105
18290
94000
e) 0.046 ×10
f) 2.01×103
5
2010
4600
Q.2 Workout the following divisions.
b) 2.356 ÷ 10−3
a) 1.12 ÷ 10−3
1120
2356
d) 1.891 ÷ 100
c) 5.832 ÷ 10−2
1.891
583.2
f) 0.39 ÷ 10−2
e) 0.7 ÷ 102
0.007
0.0039
Q.3 Write each of the following numbers to one significant figure.
b) 1458
a) 3.215
1000
3
d) 0.061
c) 8702
0.06
9000
Q.4 Write each of the following numbers to two significant figures.
b) 23.57
a) 6547
24
6500
d) 7.31
c) 0.975
7.3
0.98
Q.5 Write each of the following numbers to three significant figures.
a) 0.7215
0.722
b) 3.8564
3.86
c) 1.063
1.06
d) 556.87
557
Cambridge2122
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Q.6 Estimate the answers to the calculations below.
a) 749 × 23
14000
b) 6.9 × 387
28000
c) 0.612 ÷ 3.1
0.2
d) 0.899 ÷ 0.31
3
81
b) 4(13 + 33 ) + 2
114
2
d) 9 ( 22 + 42 ) − 20(32 )
Q.7 Work out the following.
a) 3(52 + 22 ) − 2(22 − 12 )
c)
(62 − 25 )
2
Sr.no
Success Criteria
1.
I can multiply the given decimal number by powers of 10
2.
I can write the given numbers to one significant figure.
3.
I can write the given numbers to two significant figures.
4.
I can write the given numbers to three significant figures.
5.
I can multiply and divide the rounded numbers.
6.
I can estimate the given answer.
Cambridge 21-22
0
Proficiency
column
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The parameters in the Success Criteria column will depend on the task.
The students will rate their performance in the Proficiency column.
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Cambridge 21-22
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