1. A lesson to investigate estimations
Mixed Starter M A T H S
MIXED STARTER
Write the first five multiples of 3
Write all the factors of 40
Find x.
120 x
35% of 40 miles
Calculate
A lesson to investigate estimations
Calculate 42
122 43 26
LO: To round values and estimate calculations

2. A lesson to investigate estimations
Friday, 12 April 2019
Estimates
Core: will be able to perform estimates
Challenge: use estimates to moderate answers/correct work.
Aspire: to find accuracy of estimations
Vivo Star: to understand when it is appropriate to be less/more accurate
Key words – Round, estimate and accuracy.
A lesson to investigate estimations
LO: To round values and estimate calculations

3. rounding and estimation? A
What do you know about
rounding and estimation? M A T H S
ACQUIRE FLUENCY
What is 114 rounded to the nearest 10?
What is 299 rounded to the nearest 10?
What is 155 rounded to the nearest 10?
A lesson to investigate estimations
What is rounded to three decimal places?
Estimate
LO: To round values and estimate calculations

4. A lesson to investigate estimations
Why estimate? M A T H S
TALK ABOUT IT
Mr. Morgan’s Shopping…
Milk £1.03
Bread £0.73
Chocolate £2.34
Chicken £3.45
Beans £0.43
£1.00
£0.70
£2.30
£3.50
£0.40
A lesson to investigate estimations
7.98
7.90
Estimate 376 x 32
LO: To round values and estimate calculations

5. A lesson to investigate estimations
Get estimating! M A T H S
HAVE A GO
Sum
Option A
Option B
Option C 1
3.23 x 10.3
15.3
333.69
33.269 2
x 3
2023.3
3699.9
364.4 3
19.2 x 200.1
6543.3 4
2.43 x 0.51
5.321
1.2393
0.3432 5
23.2 x 9.8
177.32
227.36
302.3
A lesson to investigate estimations
1) Estimate the length of 29 pieces of wood laid end-to-end if each is 1.48m long.
2) James has worked out 31.5 × 49.6 and got the answer Use estimation to check whether his answer is likely to be correct.
LO: To round values and estimate calculations

6. A lesson to investigate estimations
Morg’s grand design M A T H S
SUM IT UP
Kitchen
£300
9.8m
A lesson to investigate estimations
Key
£304.19
£4.85 per square meter
Kitchen
6.4m
LO: To round values and estimate calculations

7. A lesson to investigate estimations
Morg’s grand design M A T H S
SUM IT UP
Pizzeria
Cinema
Games Room
Swimming Pool
4.6m
5.8m
5.6m
10.4m
6.4m
3.6m
Ground Floor
Games
Swimming
£3.99 per square meter
£2.80 per square meter
£3.10 per square meter
£5.99 per square meter
A lesson to investigate estimations
LO: To round values and estimate calculations

8. A lesson to investigate estimations
Morg’s grand design M A T H S
SUM IT UP
Cinema
Games Room
£72
Ground Floor
10.4m
3.6m
Pizzeria
£71.42
£120
£180
Swimming Pool
£216
5.8m
A lesson to investigate estimations
£163.07
5.8m
£106.45
£222.35
4.6m
6.4m
5.6m
Total estimated cost: £588
Actual cost: £563.28
LO: To round values and estimate calculations