Page 170 - NUMINO Challenge_M2
P. 170
Problem solving
1 Reverse the subtraction expression and write it as an addition expression.
The sum of the ones place is 4+6=10, so the ones place is a 0.
The sum of the tens place is 1+ +8= , and the sum of the hundreds
place is 1, so the tens place cannot be regrouped to the hundreds place.
104 190
86 86
190 104
2 The addition expression is made with all different numbers.
The missing numbers can be 2, 3, 4, 6, 8, or 9. A7
In the ones place, 7+ C =15, so C =8. BC
In the tens place, 1+ A + B =10, so A + B =9. 105
The two numbers out of the remaining numbers (2, 3, 4, 6, 9)
that have a sum of 9 are 3 and 6.
37 or 67
68 38
105 105
3. Numbers Represented as Figures
EEExxxeeerrrccciiissseee =2 += =4
=4 += =8
=8 += =16
EEExxxeeerrrccciiissseee Complete the table to find what and represent.
Number represented by 13 12 11 10 9 8 7
Number represented by 123 7
14 14 14 45 6 14
12 10 8 0
14 14 14
64 2
=8, =6
33Answer Key
1 Reverse the subtraction expression and write it as an addition expression.
The sum of the ones place is 4+6=10, so the ones place is a 0.
The sum of the tens place is 1+ +8= , and the sum of the hundreds
place is 1, so the tens place cannot be regrouped to the hundreds place.
104 190
86 86
190 104
2 The addition expression is made with all different numbers.
The missing numbers can be 2, 3, 4, 6, 8, or 9. A7
In the ones place, 7+ C =15, so C =8. BC
In the tens place, 1+ A + B =10, so A + B =9. 105
The two numbers out of the remaining numbers (2, 3, 4, 6, 9)
that have a sum of 9 are 3 and 6.
37 or 67
68 38
105 105
3. Numbers Represented as Figures
EEExxxeeerrrccciiissseee =2 += =4
=4 += =8
=8 += =16
EEExxxeeerrrccciiissseee Complete the table to find what and represent.
Number represented by 13 12 11 10 9 8 7
Number represented by 123 7
14 14 14 45 6 14
12 10 8 0
14 14 14
64 2
=8, =6
33Answer Key
