smc-708-70-Number lines

Number and Algebra, NAP-D1-32 SA

What number is exactly halfway between 195 and 235?

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`215`

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`text(Each interval is worth 5.)`

`text(Halfway is 4 intervals from each number.)`

What is the missing number on this number line?

`50`	`55`	`60`	`65`

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`60`

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`text(Strategy one:)`

`text(Each interval jumps 15.)`

`:.\ text(Missing number is 45 + 15 = 60.)`

`text(Strategy two:)`

Some ink is covering the next number on this number line.

What number is under the ink?

`103`	`104`	`105`	`1003`

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`104`

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`104`

Which arrow points to the number that is halfway between 12 and 24?

`A`	`B`	`C`	`D`

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`B`

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`text(Halfway distance from 12 to 24)`

`= (24 + 12)/2`

`= 36/2`

`= 18`

`text{(This point can be confirmed by the three interval}`

`text{jumps needed from both 12 and 24 to reach 18)}`