Exercise 2B
Q1 | Ex-2B | Class 7 | Schand New Learning Composite | Fractions and Decimals | Chapter 2| myhelper
Question 1
Simplify :
(a) $\frac{1}{3}+\frac{1}{3}+\frac{1}{3}+\frac{1}{3}$
Sol :
$=\frac{1+1+1+1}{3}$
$=\frac{4}{3}=1\frac{1}{3}$
(b) $\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}+\frac{2}{5}$
Sol :
$=\frac{2+2+2+2+2}{5}$
$=\frac{10}{5}$
=2
Q2 | Ex-2B | Class 7 | Schand New Learning Composite | Fractions and Decimals | Chapter 2| myhelper
Question 2
(a) $7\times \frac{1}{8}$Sol :
(b) $8\times \frac{2}{15}$
Sol :
$=\frac{16}{15}=1\frac{1}{15}$
(c) $8\times \frac{3}{4}$
Sol :
$=\frac{24}{4}$
=6
(d) $20\times \frac{4}{5}$
Sol :
=16
Question 3
(a) $4\frac{7}{9}\times 12$
Sol :
$=\frac{43}{9}\times 12=\frac{172}{3}$
$=57\frac{1}{3}$
(b) $\frac{1}{48}\times 6$
Sol :
$=\frac{1}{8}$
(c) $2\frac{1}{10}\times 15$
Sol :
$=\frac{21}{10}\times 15$
$=\frac{63}{2}=31\frac{1}{2}$
(d) $4\frac{1}{6}\times 3$
Sol :
$=\frac{25}{6}\times 3$
$=12\frac{1}{2}$
Question 4
Evaluate each expression. write each answer in simplest form
(a) 15a for a $=\frac{11}{15}$
Sol :
$=15\times \frac{11}{15}$
=11
(b) $\frac{2}{3} x$ for $x=27$
Sol :
$=\frac{2}{3}\times 21$
=18
(c) $\frac{1}{4} y$ for $y=36$
Sol :
$=\frac{1}{4}\times 36$
=9
Question 5
Compare write >, < or =
(a) $8 \times \frac{1}{20} \square \frac{1}{3}$
Sol :
$8\times \frac{1}{20}=\frac{2}{5}$
$\frac{2}{5} \square \frac{1}{3}$
L.C.M of 5,3 is 15
$\frac{2\times 3}{5\times 3}=\frac{6}{15}$
$\frac{1 \times 5}{3 \times 5}=\frac{5}{15}$
$8\frac{1}{20}>\frac{1}{3}$
(b) $7 \square 28 \times \frac{2}{7}$
Sol :
$28\times \frac{2}{7}$
$7<28\times \frac{2}{7}$
(c) $8 \times \frac{3}{32} \square \frac{3}{4}$
Sol :
$8\times \frac{3}{32}=\frac{3}{4}$
Question 6
Nishi spent 90 minutes completing her homework Of those minutes she spent $\frac{1}{9}$ minutes on learning spelling how much time did Nishi spent on learning spelling?
Sol :
Nishi spend time on learning spellings $= \left(90 \times \frac{1}{9}\right)$ m
= 10 m.
No comments:
Post a Comment