Page 174 - NUMINO Challenge_M2
P. 174
Problem solving
1 7+3+4=14 To make 14, 4 is added to 12, and then 2 is subtracted.
4=12 4 2
73 To make 6, 7 is added to 3, and then 4 is subtracted.
12-4-2=6 4=12 4 2
73
2 If + or - is not placed between 1 and 2, it can be read as 12. If 3 and 4 are
subtracted from 12 and then 5 is added, then 12-3-4+5=10.
12 - 3 - 4 + 5 =10
Type Study The numbers rolled when 3 dice are thrown are 2, 3, and 6, so the bowling
pins 2, 3, and 6 can be knocked down. The remaining pins are 1, 4, 5, 7,
8, 9, and 10.
The following shows the numbers 2, 3, and 6, and the symbols + and -
used to make the remaining numbers.
1 =3-2 4 =6-2
5 =3+2 7 =6-2+3
8 =6+2 9 =6+3
10 =^
The pin that cannot be knocked down is 10.
Problem solving
1 The following shows the numbers that can be made with the give number
cards.
10=7+3 5=7-3+1 12=
6=7-1 or 6=13-7 14=17-3
2 The following shows the numbers made with the given number cards and
operation symbols.
2^5+9=19
9^2+5=23
37Answer Key
1 7+3+4=14 To make 14, 4 is added to 12, and then 2 is subtracted.
4=12 4 2
73 To make 6, 7 is added to 3, and then 4 is subtracted.
12-4-2=6 4=12 4 2
73
2 If + or - is not placed between 1 and 2, it can be read as 12. If 3 and 4 are
subtracted from 12 and then 5 is added, then 12-3-4+5=10.
12 - 3 - 4 + 5 =10
Type Study The numbers rolled when 3 dice are thrown are 2, 3, and 6, so the bowling
pins 2, 3, and 6 can be knocked down. The remaining pins are 1, 4, 5, 7,
8, 9, and 10.
The following shows the numbers 2, 3, and 6, and the symbols + and -
used to make the remaining numbers.
1 =3-2 4 =6-2
5 =3+2 7 =6-2+3
8 =6+2 9 =6+3
10 =^
The pin that cannot be knocked down is 10.
Problem solving
1 The following shows the numbers that can be made with the give number
cards.
10=7+3 5=7-3+1 12=
6=7-1 or 6=13-7 14=17-3
2 The following shows the numbers made with the given number cards and
operation symbols.
2^5+9=19
9^2+5=23
37Answer Key
