a.3/7 +4/21
= 3X3/7X3 +4/21
=9/21+4/21
=13/21
b.-1/3+1
= 1-1/3
= 2/3
c.1/2+1/4+1/8
=1X4/2X4+1X2/4X2+1/8
=4/8+2/8+1/8
=7/8
d.5/12-2/3
=5/12-2X4/3X4
=5/12-8/12
=-3/12
e.1X8X3
———
2X6X2
=1X2X2X2X3
—————
2X2X3X2
=1
f.-5/2X(-2/3)X3/5
=5/3X3/5
=1
g.(-2)X5X(-4)X3X7X(-5)
————————————
-10X6
= (-2)X5X(-2)X2X3X7X(-5)
————————————
-2X5X3X2
=-2X7X(-5)
—————
1
a.3/10
b.3X5X3X7
—————
7X7X5X5
=9/35
c.2X3X2X3X2X2X2X3
——————————
2X4X2X2X2X3X2X5
=3X3
—————
4X2X5
=9/40
d.11X5X4X2X3
———————
4X2X4X11X3
=5/4
a.2/15+2/5
=2/15+2X3/5X3
=2/15+6/15
=8/15
b.3/4+5/4
=8/4
=2/1
c.5/2-21/10
=5X5/2X5-21/10
=25/10-21/10
=4/10
=2/5
