Understand Number Lines

[object Object],[object Object],[object Object],Recall… 80 90 1 Sub-unit 1 Unit +1 +1 +1 +1 +1 +1 +1 +1 +1 +1

[object Object],Recall… 80 90 1 Sub-unit 1 Unit b b) 80 + 7 = 87 a a) 80 + 5 = 85 +1 +1 +1 +1 +1 +1 +1

WB page 17 Q1 Use the number line to answer Question (I) ,[object Object],[object Object],20 30 40 50 26 35 48

Ribbon A is 82 cm long. ,[object Object],[object Object],[object Object],[object Object],[object Object],80 85 90 82

Ribbon B is 17 cm long. 10 20 15 17 17 is between 10 and 20. It is nearer to 20 than to 10. 17 is 20 when rounded off to the nearest ten. 17 is approximately equal to 20. 17  20

Ribbon C is 95 cm long. 90 100 95 95 95 is exactly halfway between 90 and 100. 95 is 100 when rounded off to the nearest ten. 95  100 Why numbers with 5 in the ones place is rounded off to the next tens? The number 5 is at the centre. The convention is to round off the number to the next tens.

‘ Rounding off to the nearest ten’ Strategy ,[object Object],[object Object]

Find all the numbers that give the following answer when rounded off to the nearest ten. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Practice time... (Do Maths TB page 26 Qns 10a and b)

Understand Number Lines

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Understand Number Lines