Solution

38788

Problem
Pairs of Numbers Back to problem
First name
Benjamin Seville
School
West Oxford Primary School
Country
England
Age
6

PAIRS THAT MAKE 10 ARE
1+9, 2+8, 3+7, 4+6
8 COUNTERS WERE USED. COUNTERS 10 AND 5 WERE NOT USED.

PAIRS THAT MAKE 12 ARE
2+10, 3+9, 4+8, 5+7
8 COUNTERS WERE USED. COUNTERS 1 AND 6 WERE NOT USED.

PAIRS THAT MAKE 13 ARE
3+10, 4+ 9, 5+8, 6+7
8 COUNTERS WERE USED. COUNTERS 1 AND 2 WERE NOT USED

PAIRS THAT MAKE 11
1+10, 2+9, 3+8, 4+7, 5+6
10 COUNTERS WERE USED. ALL COUNTERS WERE USED.