Page 141 - NUMINO Challenge_M1

Type StudyAnswer
Key

Problem solving

1 The following represents the cut part of the square.

The cut part is 11 grid lengths, which is 11 cm.

2 Use the grid length as the unit length and compare the lengths of the paths.

Since all four paths have the same horizontal length of 12 units, only the number of
vertical units need to be counted.
The length of path A is 12+3=15 units.
The length of path B is 12+9=21 units.
The length of path C is 12+4=16 units.
The length of path D is 12+14=26 units.

The longest path is D.

2. Comparing Weights
EEExxxeeerrrccciiissseee A balancing scale slants to the heavier side and balances when the weight on

both sides is equal. The first scale should slant towards , and the second
scale should hold objects of the same weight, and .

EEExxxeeerrrccciiissseee The scale is balanced if 2 C’s are placed on the left plate and 3 D’s are placed
on the right plate.
C+C=D+D+D

C is heavier than A, and A is heavier than B. B D is heavier than B and lighter than A, so B
C>A>D>B

4 NUMINO Challenge M1