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 -6 - -3 + -7 - 20 - -30 A lesson to investigate estimations Calculate 42 122 43 26 LO: To round values and estimate calculations

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

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 12.4545 rounded to three decimal places? Estimate 592 - 27 LO: To round values and estimate calculations

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

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 1233.3 x 3 2023.3 3699.9 364.4 3 19.2 x 200.1 3841.92 1602.23 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 156.24. Use estimation to check whether his answer is likely to be correct. LO: To round values and estimate calculations

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

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

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