1. **Problem:** Calculate $(+98) - (+88)$. 2. **Formula:** Subtraction of integers: $a - b = a + (-b)$. 3. **Step:** Rewrite subtraction as addition of the opposite: $$+98 - (+88) = +98 + (-88)$$ 4. **Step:** Calculate: $$98 + (-88) = 98 - 88 = 10$$ 5. **Answer:** $10$ 1. **Problem:** Calculate $(-95) - (-40)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$-95 - (-40) = -95 + 40$$ 4. **Step:** Calculate: $$-95 + 40 = -55$$ 5. **Answer:** $-55$ 1. **Problem:** Calculate $(+38) - (+31)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$38 - 31 = 38 + (-31)$$ 4. **Step:** Calculate: $$38 - 31 = 7$$ 5. **Answer:** $7$ 1. **Problem:** Calculate $(+41) - (-29)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$41 - (-29) = 41 + 29$$ 4. **Step:** Calculate: $$41 + 29 = 70$$ 5. **Answer:** $70$ 1. **Problem:** Calculate $(+94) - (+59)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$94 - 59 = 94 + (-59)$$ 4. **Step:** Calculate: $$94 - 59 = 35$$ 5. **Answer:** $35$ 1. **Problem:** Calculate $(-26) - (+21)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$-26 - 21 = -26 + (-21)$$ 4. **Step:** Calculate: $$-26 - 21 = -47$$ 5. **Answer:** $-47$ 1. **Problem:** Calculate $(+97) - (+42)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$97 - 42 = 97 + (-42)$$ 4. **Step:** Calculate: $$97 - 42 = 55$$ 5. **Answer:** $55$ 1. **Problem:** Calculate $(-87) - (-21)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$-87 - (-21) = -87 + 21$$ 4. **Step:** Calculate: $$-87 + 21 = -66$$ 5. **Answer:** $-66$ 1. **Problem:** Calculate $(-27) - (+32)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$-27 - 32 = -27 + (-32)$$ 4. **Step:** Calculate: $$-27 - 32 = -59$$ 5. **Answer:** $-59$ 1. **Problem:** Calculate $(+99) - (-79)$. 2. **Formula:** $a - b = a + (-b)$. 3. **Step:** Rewrite: $$99 - (-79) = 99 + 79$$ 4. **Step:** Calculate: $$99 + 79 = 178$$ 5. **Answer:** $178$