Unit 01 // Session C // Master when ready
A double is the fastest fact there is. Learn the doubles, then use them for their neighbours. Le double.
Two equal rows. How many altogether?
The rows match, so this is a double. Say it out loud: four and four is eight.
3 + 3
4 + 4
5 + 5
6 + 6
7 + 7
8 + 8
Every double, no pictures.
These are worth knowing by heart. Come back to this box each day until it is quick.
One more than a double.
The bottom row has one extra dot. Start from the double you already know, then add one.
7 + 8
6 + 7
8 + 9
One less than a double.
Take the double of the bigger number, then take one away.
Your turn. Write the double you used.
Say the double out loud first, then the answer. Two words before the number.
She names the double before she answers, without being asked. "Seven and seven is fourteen, so seven and eight is fifteen." A pause while she finds the double is fine. Counting up one by one means repeat this session.
Near doubles are the shortest route for any pair one apart: 6 + 7, 7 + 8, 8 + 9. Reach for this before making ten, because it holds only one fact in the head instead of three. Session D covers the pairs that are further apart.
MathNest · Unit 01 · Session C · Doubles and near doubles