Add 4: Addition Facts

Zoorithmetic https://zoorithmetic.com/

Add 4 is a double of the double: 2 + 2 is 4, so this family builds straight on add 2.

Counting on from 4

Answers climb one at a time from 5 to 16, and the double 4 + 4 = 8 sits at the fourth step as an anchor.

Add 2 twice. For 4 + 7, 7 + 2 = 9 and 9 + 2 = 11. Or use the double 4 + 4 = 8 and count from there: 4 + 5 is one more.

These sit just past ten. Use the double 4 + 4 = 8 and count on: 4 + 7 is 4 + 4 + 3.

Swapping the numbers gives the same answer, so each fact below is learned once and used twice.

Untimed by default. A missed fact shows its answer and comes back later in the round.

One US Letter page, clear in black and white.

10 questions, no timer. At the end you see the score, the facts to practice and a sheet you can print.

A double like 4 + 4 is easy to remember and gives its neighbors for free: 4 + 5 is one more than 8, which is 9.

Most children need about a week of ten minutes a day. Start with 4 + 1 to 4 + 5 and add the second half once the first feels easy.