Times Market — Lesson 82: The 3 table and the 4 table
Turn it around →Lesson 82: Abacus times tables: 3 and 4
Level 7, Times Market. Groups of 3 and groups of 4, built on the beads.
What your child does, card by card
The 3 table and the 4 table. Count by 3. Then count by 4. PlayType opens the lesson: “Times means groups of the same number.”
Watch me: 3, 8, 6, 9, 2, 12, 17 and 15 appear on the beads one move at a time, each bead ringed in green before it goes. Five groups of 3.
Try it puts a green ring on each next bead; your child works out 10 × 3.
4, 8, 12, 16, 20: the abacus makes 4, 9, 8, 2, 12, 17, 16, 10 and 20 by itself, a green ring on each bead just before it moves, and the sum sheet below ticks each line. Five groups of 4.
In Try it a green ring marks the next bead while your child works out 10 × 4.
The tiny practice drops the ring: work out 6 × 3, 7 × 4, 8 × 3, 9 × 4 and 7 × 3, each round starting from its own number.
Then the beads hide and the sums 5 × 3, 4 × 4 and 9 × 3 are done in the head, the answer picked from 15, 16 and 27.
You're ready! You can count by 3 and by 4.
What this lesson trains
About five minutes and 18 answers. Altogether the child makes 34 bead moves (10 with the top bead, 24 with bottom beads). Numbers reach 40, so the tens rod and the ones rod work. Then 3 quick looks in your head. Friends do 7 of the 15 sums, by +3 = −7 +10, +3 = +5 −2, +4 = +5 −1 and +4 = −6 +10.
The first thing your child does: work out 10 × 3.
The sum sheet
In Column Tower the lower window is a sum sheet instead of the hands: the column written out one line under another, the line being worked in yellow, the lines done ticked, and the total once the last line is in. The beads keep the running total, so the abacus is never cleared in the middle of a column.
What PlayBuddy and PlayType say
PlayType: “Times means groups of the same number.”
Stars
With 1 or fewer slips across the 18 answers your child earns three stars; 4 or fewer, two.