Page 150 - NUMINO Challenge_D1
P. 150
5 Mobiles p.42~p.43 Problem solving
2 lighter, heavier, 1 From balances and , observe that
, ,,
Example . On balance , must be the heaviest
weight for and to weigh the same as
and . Therefore, .
Example 2 6, 4 2 When you remove the same fruits from both
TryItAgain Since and are the same distance away plates, the balances are as shown below.
from the center point, the weight of is
also 2 g. Therefore, since the product of the On balance , 1 apple weighs the same as 1
center point and the distance needs to be mandarin and 1 kiwi, so the apple is the
equal, 2g in the equation 2 1 4. heaviest. On balance , replace the apple with
1 mandarin and 1 kiwi and remove the kiwi from
21 both plates. Then, there are 2 mandarins on the
left plate, and there are 2 kiwis on the right
4g plate. Therefore, the mandarin is the 2nd
heaviest, so the order is: apple mandarin kiwi.
Type 5-1 The Order of Weights p.44~p.45
1 Use the weight of 2 pencils as a standard to Type 5-2 Making Mobiles p.46~p.47
compare other weights. The eraser is heavier
than the pen because the 2 pencils weigh the 12 3.
same as the eraser. The eraser is also heavier 2 1 g, 2 g or 2 g, 4 g
than the pencil. Therefore, the eraser is the 3 1 g, 2 g, 3 g
heaviest. 4 4 g in the equation 6 2
2 pen
3 eraser, pen, pencil
4 On balance , observe that the eraser is
heavier than the glue stick. On balance ,
observe that the glue stick is heavier than the
pen. Therefore, the order of the four supplies
from heaviest to lightest is eraser, glue stick,
pen, and pencil.
Answer Key
2 lighter, heavier, 1 From balances and , observe that
, ,,
Example . On balance , must be the heaviest
weight for and to weigh the same as
and . Therefore, .
Example 2 6, 4 2 When you remove the same fruits from both
TryItAgain Since and are the same distance away plates, the balances are as shown below.
from the center point, the weight of is
also 2 g. Therefore, since the product of the On balance , 1 apple weighs the same as 1
center point and the distance needs to be mandarin and 1 kiwi, so the apple is the
equal, 2g in the equation 2 1 4. heaviest. On balance , replace the apple with
1 mandarin and 1 kiwi and remove the kiwi from
21 both plates. Then, there are 2 mandarins on the
left plate, and there are 2 kiwis on the right
4g plate. Therefore, the mandarin is the 2nd
heaviest, so the order is: apple mandarin kiwi.
Type 5-1 The Order of Weights p.44~p.45
1 Use the weight of 2 pencils as a standard to Type 5-2 Making Mobiles p.46~p.47
compare other weights. The eraser is heavier
than the pen because the 2 pencils weigh the 12 3.
same as the eraser. The eraser is also heavier 2 1 g, 2 g or 2 g, 4 g
than the pencil. Therefore, the eraser is the 3 1 g, 2 g, 3 g
heaviest. 4 4 g in the equation 6 2
2 pen
3 eraser, pen, pencil
4 On balance , observe that the eraser is
heavier than the glue stick. On balance ,
observe that the glue stick is heavier than the
pen. Therefore, the order of the four supplies
from heaviest to lightest is eraser, glue stick,
pen, and pencil.
Answer Key
