Even and Odd Numbers

Some numbers can be split into PAIRS with nothing left over — these are EVEN numbers. Some numbers always have ONE extra — these are ODD. Once you know the difference, you can tell ANY number even or odd in under a second.

Grab some counting items (pennies, buttons, beans). Try to make PAIRS:\n\n- 4 pennies: 2 pairs. No leftover. EVEN.\n- 5 pennies: 2 pairs + 1 alone. ODD.\n- 6 pennies: 3 pairs. EVEN.\n- 7 pennies: 3 pairs + 1 alone. ODD.\n\nNumbers that pair up perfectly are EVEN. Numbers with one left over are ODD.

You don't need pennies every time. Just look at the LAST DIGIT:\n\n- Ends in **0, 2, 4, 6, 8** → EVEN\n- Ends in **1, 3, 5, 7, 9** → ODD\n\nSo 348 is EVEN (ends in 8). And 251 is ODD (ends in 1). This works for ANY number — even 1,000,000 (even, ends in 0).

Here is a magic rule:\n\n- EVEN + EVEN = EVEN (like 4 + 6 = 10)\n- ODD + ODD = EVEN (like 3 + 5 = 8)\n- EVEN + ODD = ODD (like 4 + 5 = 9)\n\nPlaying with pennies shows why: two groups that pair up + another two groups that pair up still all pair up!

Knowing even and odd helps with:\n\n- Sharing fairly (can 7 kids each get 1 piece of 14 candies? YES — 14 is even!)\n- Pairs of socks\n- Taking turns\n- Stacking blocks\n- Even and odd building addresses on a street\n\nAdults use this daily without thinking. Now you do too.