Page 166 - NUMINO Challenge_M2
P. 166
Type Study Each number card must only be used once, so 0 must be placed after 2 in
the third expression.
^ =2 0
The two numbers that have a product of 20 are 4 and 5 .
4 ^ 5 = 2 0 or 5 ^ 4 = 2 0
The remaining number cards are: 1 , 3 , 6 , 7 , 8 , and 9 . The
numbers that can make an addition or subtraction expression are ( 1 , 7
, 8 ) and ( 3 , 6 , 9 ).
1 + 7 = 8 or 7 + 1 = 8 , 3 + 6 = 9 or 6 3 = 9
8 - 1 = 7 or 8 - 7 = 1 , 9 - 3 = 6 or 9 - 6 = 3
Problem solving
1 A sum of 5 can be made by adding 1 and 4 or 2 and 3.
If using 1+4=5, the remaining numbers would be 2, 3, 6, 7, and 8. These
numbers must be used to make an addition expression that has a sum of 9
and 10.
3+6=9 (or 6+3=9)
2+8=10 (or 8+2=10)
Number that cannot be used: 7
If using 2+3=5, the remaining numbers would be 1, 4, 6, 7, and 8. These
numbers must be used to make an addition expression that has a sum of 9
and 10.
1+8=9 (or 8+1=9)
4+6=10 (or 6+4=10)
Number that cannot be used: 7
When completing the addition expressions, 7 cannot be used.
2 A number must be subtracted from the sum of two numbers to make 0, so the
number that is subtracted must be equal to the sum of the two numbers.
6 + 2 - 8 = 0 or 2 + 6 - 8 = 0
6 + 3 - 9 = 0 or 3 + 6 - 9 = 0
7 + 2 - 9 = 0 or 2 + 7 - 9 = 0
29Answer Key
the third expression.
^ =2 0
The two numbers that have a product of 20 are 4 and 5 .
4 ^ 5 = 2 0 or 5 ^ 4 = 2 0
The remaining number cards are: 1 , 3 , 6 , 7 , 8 , and 9 . The
numbers that can make an addition or subtraction expression are ( 1 , 7
, 8 ) and ( 3 , 6 , 9 ).
1 + 7 = 8 or 7 + 1 = 8 , 3 + 6 = 9 or 6 3 = 9
8 - 1 = 7 or 8 - 7 = 1 , 9 - 3 = 6 or 9 - 6 = 3
Problem solving
1 A sum of 5 can be made by adding 1 and 4 or 2 and 3.
If using 1+4=5, the remaining numbers would be 2, 3, 6, 7, and 8. These
numbers must be used to make an addition expression that has a sum of 9
and 10.
3+6=9 (or 6+3=9)
2+8=10 (or 8+2=10)
Number that cannot be used: 7
If using 2+3=5, the remaining numbers would be 1, 4, 6, 7, and 8. These
numbers must be used to make an addition expression that has a sum of 9
and 10.
1+8=9 (or 8+1=9)
4+6=10 (or 6+4=10)
Number that cannot be used: 7
When completing the addition expressions, 7 cannot be used.
2 A number must be subtracted from the sum of two numbers to make 0, so the
number that is subtracted must be equal to the sum of the two numbers.
6 + 2 - 8 = 0 or 2 + 6 - 8 = 0
6 + 3 - 9 = 0 or 3 + 6 - 9 = 0
7 + 2 - 9 = 0 or 2 + 7 - 9 = 0
29Answer Key
