Page 39 - NUMINO Challenge_D2
P. 39
Type 4-1 Picking the Card You Need
There are 30 cards numbered 1 to 30. If Susan picks out two cards, at
least how many cards does she need to pick out in order to have 18 as
the difference?
12345 27 28 29 30
1 Among the 30 cards, find all the pairs that have 18 as the difference
between the two numbers.
(,) (,) (,) (,) (,) (, )
(,) (,) (,) (,) (,) (, )
2 Cross out all the cards that cannot be paired with another card to have 18
as their difference.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
3 Among the 24 cards that have 18 as the difference between the two
numbers, at least how many cards should be picked in order to have a
difference of 18?
4 Among the 30 cards, at least how many cards does Susan need to pick
out in order to have a difference of 18?
36 NUMINO Challenge D2
There are 30 cards numbered 1 to 30. If Susan picks out two cards, at
least how many cards does she need to pick out in order to have 18 as
the difference?
12345 27 28 29 30
1 Among the 30 cards, find all the pairs that have 18 as the difference
between the two numbers.
(,) (,) (,) (,) (,) (, )
(,) (,) (,) (,) (,) (, )
2 Cross out all the cards that cannot be paired with another card to have 18
as their difference.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
3 Among the 24 cards that have 18 as the difference between the two
numbers, at least how many cards should be picked in order to have a
difference of 18?
4 Among the 30 cards, at least how many cards does Susan need to pick
out in order to have a difference of 18?
36 NUMINO Challenge D2
