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Doubling, Halving & More
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Doubling
Double numbers to 10
\[ \text{Double } 7 = 14 \]
Double a number from 1 to 10.
Double numbers to 20
\[ \text{Double } 16 = 32 \]
Double a number from 11 to 20.
Double numbers to 50
\[ \text{Double } 34 = 68 \]
Double a number from 21 to 50.
Double numbers to 100
\[ \text{Double } 68 = 136 \]
Double a number from 51 to 100.
Double numbers to 200
\[ \text{Double } 145 = 290 \]
Double a number from 101 to 200.
Double numbers to 500
\[ \text{Double } 370 = 740 \]
Double a number from 201 to 500.
Trebling
Treble numbers to 10
\[ \text{Treble } 6 = 18 \]
Treble a number from 1 to 10.
Treble numbers to 20
\[ \text{Treble } 15 = 45 \]
Treble a number from 11 to 20.
Treble numbers to 50
\[ \text{Treble } 24 = 72 \]
Treble a number from 21 to 50.
Treble numbers to 100
\[ \text{Treble } 85 = 255 \]
Treble a number from 51 to 100.
Treble numbers to 200
\[ \text{Treble } 130 = 390 \]
Treble a number from 101 to 200.
Treble numbers to 500
\[ \text{Treble } 250 = 750 \]
Treble a number from 201 to 500.
Quadrupling
Quadruple numbers to 10
\[ \text{Quadruple } 8 = 32 \]
Quadruple a number from 1 to 10.
Quadruple numbers to 20
\[ \text{Quadruple } 14 = 56 \]
Quadruple a number from 11 to 20.
Quadruple numbers to 50
\[ \text{Quadruple } 35 = 140 \]
Quadruple a number from 21 to 50.
Quadruple numbers to 100
\[ \text{Quadruple } 72 = 288 \]
Quadruple a number from 51 to 100.
Quadruple numbers to 200
\[ \text{Quadruple } 125 = 500 \]
Quadruple a number from 101 to 200.
Quadruple numbers to 500
\[ \text{Quadruple } 310 = 1240 \]
Quadruple a number from 201 to 500.
Halving
Halve numbers to 20
\[ \text{Halve } 14 = 7 \]
Halve an even number up to 20.
Halve numbers to 50
\[ \text{Halve } 38 = 19 \]
Halve an even number from 22 to 50.
Halve numbers to 100
\[ \text{Halve } 74 = 37 \]
Halve an even number from 52 to 100.
Halve numbers to 200
\[ \text{Halve } 156 = 78 \]
Halve an even number from 102 to 200.
Halve numbers to 500
\[ \text{Halve } 420 = 210 \]
Halve an even number from 202 to 500.
Finding a Third
Find a third of numbers to 50
\[ 36 \div 3 = 12 \]
Find a third of a multiple of 3 up to 50.
Find a third of numbers to 100
\[ 72 \div 3 = 24 \]
Find a third of a multiple of 3 from 51 to 100.
Find a third of numbers to 200
\[ 150 \div 3 = 50 \]
Find a third of a multiple of 3 from 102 to 200.
Find a third of numbers to 500
\[ 360 \div 3 = 120 \]
Find a third of a multiple of 3 from 201 to 500.
Quartering
Find a quarter of numbers to 50
\[ 36 \div 4 = 9 \]
Find a quarter of a multiple of 4 up to 50.
Find a quarter of numbers to 100
\[ 72 \div 4 = 18 \]
Find a quarter of a multiple of 4 from 52 to 100.
Find a quarter of numbers to 200
\[ 160 \div 4 = 40 \]
Find a quarter of a multiple of 4 from 104 to 200.
Find a quarter of numbers to 500
\[ 360 \div 4 = 90 \]
Find a quarter of a multiple of 4 from 204 to 500.
Extensions
Halve odd numbers to 20
\[ \text{Halve } 7 = 3.5 \]
Halve an odd number up to 20 to give a decimal answer.
Halve odd numbers to 50
\[ \text{Halve } 33 = 16.5 \]
Halve an odd number from 21 to 49.
Halve odd numbers to 100
\[ \text{Halve } 73 = 36.5 \]
Halve an odd number from 51 to 99.
Halve odd numbers to 200
\[ \text{Halve } 157 = 78.5 \]
Halve an odd number from 101 to 199.
Halve odd numbers to 500
\[ \text{Halve } 341 = 170.5 \]
Halve an odd number from 201 to 499.
Quarter odd numbers to 50
\[ 15 \div 4 = 3.75 \]
Find a quarter of an odd number up to 50.
Quarter odd numbers to 100
\[ 73 \div 4 = 18.25 \]
Find a quarter of an odd number from 51 to 99.
Quarter odd numbers to 200
\[ 137 \div 4 = 34.25 \]
Find a quarter of an odd number from 101 to 199.
Quarter odd numbers to 500
\[ 341 \div 4 = 85.25 \]
Find a quarter of an odd number from 201 to 499.
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