Page 130 - NUMINO Challenge_A1

3 The color of the circle changes from blue to red to blue to red, etc. Therefore, the red
circle will be at the finishing point, and its number is 32 2 64. 64

Problem solving

1 The added numbers 3, 3, and 4 are repeated in the number sequence.

Order 1 2 3 4 5 6 7 8 9
Numbers 1 4 7 11 14 17 21 24 27

33433433

2 In a sequence that starts with 1 and every other number (1, 2, 4, 7, 11, ), the added

numbers increase by 1.
In a sequence that starts with 3 and every other number (3, 5, 7, 9, ), the numbers increase
by 2.
Therefore, the number in the is the number in the sequence that starts with 3, which is 9
2 11.

12. Stone Arrangements

Investigate Arranging Stones Number of Stones in the Arrangement

1 3 5 7 16

333 333 3333
9 3 12 3 3 3 21

123 6 1234

1 12 12 122 1222
3 25 2 7 2 2 2 13

25Answer Key