Page 28 - NUMINO Challenge_C1

Basic Concepts Reaching a Target Number by Inserting or

Calculate the difference between the resulting values of an equation with
only 's and the same equation with one changed to one . This
difference is twice the subtracted number.

1 2 3 4 5 6 21
21 13 8( 4 2)

1 2 3 4 5 6 13

When the target number is greater than the sum of all the numbers, put
adjacent numbers together to form 2- or 3-digit numbers. When you form
these large numbers, it is best to form them such that their value are
close to the target number.
When making 52 with 1, 2, 3, 4, 5, 6, and 7, first put 4 and 5 together to
form 45, a number close to 52. Then use the remaining numbers, , and

to make 52.
1 2 3 45 6 7 52

Example Insert or in the to complete the equation.
1 2 3 4 5 6 7 8 24

Class Notes

Since 1 2 3 4 5 6 7 8 , to get 24 you need to make it

smaller by .

If you change a into a , the difference becomes twice the subtracted number.

So, you need to change the that comes before to a .

1 2 3 4 5 6 7 8 24

Try It Again Insert or between the numbers to make the equation
true. (You can also put two numbers together to form 2-digit
numbers.)

1 2 3 4 5 6 21

25Number and Operations