Download Division – Direct Teaching

Objectives:
•
Use halving two or three times to divide by 4
or 8
•
Divide by 5 by dividing by 10 and doubling
© Hamilton Trust
Keeping Up Term 2
Week 5 Day 3
What is the efficient mental strategy for
calculating 124 ÷ 4?
120
4
Half of 120 is 60
Half again = 30
Half of 4 is 2
Half again = 1
124 ÷ 4 = 30 + 1 = 31
© Hamilton Trust
Keeping Up Term 2
Week 5 Day 3
Use this strategy to find 248 ÷ 4
8
240
Half of 240 is ____
Half again = ____
Half of 8 is __
Half again = __
248 ÷ 4 = ___ + __ =
© Hamilton Trust
Keeping Up Term 2
Week 5 Day 3
Have a go at these two problems:
364 ÷ 4
How will you
partition 752?
© Hamilton Trust
752 ÷ 4
Keeping Up Term 2
Week 5 Day 3
Divide by 8 by halving three times
200 ÷ 8 …
200
half
100
25
50
half again
half again
200 ÷ 8 = 25
© Hamilton Trust
Keeping Up Term 2
Week 5 Day 3
Choose two of these calculations to solve
by halving three times:
864 ÷ 8
128 ÷ 8
720 ÷ 8
© Hamilton Trust
Keeping Up Term 2
352 ÷ 8
Week 5 Day 3
Another division trick… for dividing by 5
80 ÷ 5
80 ÷ 10 = 8 but dividing by 10 is twice as much dividing as
dividing by 5!
So make up for it by doubling the answer…
8 x 2 = 16
Check:
0
© Hamilton Trust
80 ÷ 5 = 16
10 x 5
6x5
50
Keeping Up Term 2
80
Week 5 Day 3
These get trickier… How far can you get?
Divide by 5
110
360
265
345
725
÷ 10
×2
Check your answers using multiplication.
© Hamilton Trust
Keeping Up Term 2
Week 5 Day 3