Page 42 - MATEMATIK (JILID 2) TAHUN 3
P. 42
4 Subtract 1 hour 15 minutes from 6 hours 40 minutes.
6 hours 40 minutes – 1 hour 15 minutes = hours minutes
3 10
6 hours 40 minutes
– 1 hour 1 5 minutes
5 hours 25 minutes
6 hours 40 minutes – 1 hour 15 minutes = 5 hours 25 minutes
5 15 minutes – 10 seconds – 12 minutes 30 seconds
= minutes seconds
1 4 6 0
1 5 minutes 0 0 seconds 1 4 minutes 5 0 seconds
– 1 0 seconds – 1 2 minutes 3 0 seconds
1 4 minutes 50 seconds 2 minutes 2 0 seconds
15 minutes – 10 seconds – 12 minutes 30 seconds
= 2 minutes 20 seconds
LET’S TRY
Calculate.
a 86 hours – 25 hours = hours
b 91 minutes – 34 minutes = minutes
c 75 seconds – 10 seconds – 17 seconds = seconds
d 4 hours 20 minutes − 15 minutes − 1 hour 50 minutes
= hours minutes
e 58 minutes 16 seconds − 17 minutes 12 seconds − 30 seconds
= minutes seconds
Saiz sebenar
AB TEACHER’S • Guide pupils to regroup from hours to minutes, and from minutes to 5.5.1 (iv)
98-99 NOTES seconds. 5.5.1 (v) 37
