Page 173 - NUMINO Challenge_M1

Answer
Key

Type Study Solve by placing the values for in each expression.

11 20- 11 9
12 20- 12 8
13 20- 13 7
14 20- 14 6

The numbers that can fit in the blank are 6, 7, 8, and 9.

Problem solving

1 The sum of a number and 17 is 17 or greater than 17. 17+ <21, so 17+ is a

number from 17 to 20.
If 17+ =17, =0.
If 17+ =18, =1.
If 17+ =19, =2.
If 17+ =20, =3.

The sum of the numbers that can fill is 0+1+2+3=6.

2 270<2 5, so can be 7, 8, or 9.
can be 0, 1, 2, 3, 4, 5, 6, or 7.
1 6<186, so
=7

3. Making Numbers With Number Cards

EEExxxeeerrrccciiissseee Use number cards to make the given numbers. 4 1 0 224 224
21 2 1 305 3 0 5 55 5 5 410

There are 6 number cards that are used: 0 , 1 , 2 , 3 , 4 , and 5 .

EEExxxeeerrrccciiissseee To make the smallest number with the given number cards 8 , 2 , 0 ,
when 0 cannot be in the hundreds place. The second largest number, 2 ,
must be placed in the hundreds place. Then, the tens place must be filled with
the smallest remaining digit, 0 .
The smallest number that can be made is 208.

36 NUMINO Challenge M1