Mastering Addition and Subtraction Skills

• 133

• 143

• 123

• 153

Answer explanation

To solve 87 + 56, add the units: 7 + 6 = 13 (regroup 1). Then add the tens: 8 + 5 + 1 = 14. Combine to get 143. Thus, the correct answer is 143.

• 87

• 77

• 67

• 97

Answer explanation

To solve 145 - 68, we regroup. Start with the ones: 5 - 8 requires borrowing, making it 15 - 8 = 7. For the tens: 3 - 6 also needs borrowing, so 14 - 6 = 7. Thus, 145 - 68 = 77.

• They are equal

• Cannot be determined

If you add 59 to a number and get 150, what is the number?

• 91

• 101

• 81

• 61

Answer explanation

To find the number, subtract 59 from 150. So, 150 - 59 = 91. Therefore, the number is 91.

If you subtract 73 from a number and the result is 85, what was the original number?

• 158

• 148

• 168

• 178

Answer explanation

Let the original number be x. The equation is x - 73 = 85. Adding 73 to both sides gives x = 85 + 73, which simplifies to x = 158. Thus, the original number is 158.