Why did we say, do we use rounding?

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Presentation transcript:

Why did we say, do we use rounding? The rule for rounding decimal places is the same as for other rounding rules, Let’s see! Why did we say, do we use rounding? To give an approximate answer When we round to decimal places we can give an approximate answer which is more accurate than when we round to the nearest whole number, 10, 100 or 1000 Decimal places are the numbers after the point Round to 1 d.p.  answer must have 1 number after point Round to 2 d.p.  answer must have 2 numbers after point Round to 3 d.p.  answer must have 3 numbers after point

Rounding To 1 Decimal Place Round 4.67 to one decimal place (1d.p). 4.6 4.7 4.67 4.65 What number is the arrow pointing at ? Mark 4.67 on the number line . Is 4.67 closer to 4.6 or 4.7 ? 4.7 4.67 = 4.7 (to 1d.p)

Round 19.53 to 1 d.p . 19.5 19.6 19.53 19.55 What number is the arrow pointing at ? Mark 19.53 on the number line . Is 19.53 closer to 19.5 or 19.6 ? 19.5 19.53 = 19.5 (to 1d.p)

Rounding to 1 Decimal Place (1DP) 4 . 8 3 2 5 4 . 8 4 2 5 4 . 8 5 2 5 or more? 5 or more? 5 or more? No No Yes 4 . 8 4 . 8 4 . 9 4 . 8 7 5 . 2 6 7 1 4 1 . 9 6 7 5 or more? 5 or more? 5 or more? Yes Yes Yes 4 . 9 5 . 3 2 . 0

Rounding to Decimal Places: 2DP 4 . 8 3 2 5 4 . 8 4 6 4 . 8 5 9 5 1 5 or more? 5 or more? 5 or more? No Yes Yes 4 . 8 3 4 . 8 5 4 . 8 6 1 . 6 9 4 9 5 . 2 6 7 1 1 . 8 9 7 5 or more? 5 or more? 5 or more? No Yes Yes 1 . 6 9 5 . 2 7 1 . 9 0

Rounding to Decimal Places: 3DP 4 . 8 3 2 5 4 . 8 4 6 2 4 . 8 5 9 5 5 or more? 5 or more? 5 or more? Yes No Yes 4 . 8 3 3 4 . 8 4 6 4 . 8 6 0 1 . 6 9 4 2 5 . 2 6 2 7 1 . 9 9 9 9 5 or more? 5 or more? 5 or more? No Yes Yes 1 . 6 9 4 5 . 2 6 3 2 . 0 0 0

Rounding to Decimal Places 1DP 2DP 3DP 4 . 8 5 2 1 . 6 9 4 9 5 . 2 6 2 7 5 or more? 5 or more? 5 or more? Yes No Yes 4 . 9 1 . 6 9 5 . 2 6 3 Copy & complete this table: Number To 1DP To 2DP To 3DP 63.4721 87.6564 149.9875 3.54029 0.59999 63.5 63.47 63.472 87.7 87.66 87.656 Your Turn 150.0 149.99 149.988 3.5 3.54 3.540 0.6 0.60 0.600