Wednesday, June 10 — Day 18

Final week, day 2. Fractions and atomic structure today.

The deal today

• 9:30 to 12:00 study, with two 20-minute breaks.
• 22 questions. A and B share nothing; B is the harder set.
• Phones off 9:30 to 1:00. The last hour is yours, no screen.

Focus today

Math — push the fractions

• Add, subtract, multiply, divide. Answers like 11/15, 7/20, 29/24 — find the common denominator carefully, then reduce.
• Five two-digit multiplications. Same rule: the slip is the last add.

Science — isotopes and atomic number

• Atomic number = number of protons. That number is the element.
• Isotopes are the same element with different neutron counts (carbon-12 vs carbon-14 — both carbon, 6 protons). We use the most common isotope for the neutron count.

Peace — the held-vs-failed pattern

• Westphalia 1648 held. Camp David 1978 / Israel-Egypt 1979 held, coldly. Dayton 1995 froze a war more than it solved it.

Today's exam (22 questions)

• 11 math (5 two-digit multiplication, GCF, LCM, all four fraction ops)
• 7 science (valence + protons/neutrons/electrons)
• 4 history (Westphalia, Camp David, Israel-Egypt, Dayton)
• No evolution.

Help links

• Atomic structure & periodic table
• Valence electrons
• Multiplication table & breakdown
• Peace accords
• GCF · LCM