Sharing Garden — Lesson 97: When the tens leave some over
Sharing practice: two-digit numbers →Lesson 97: Abacus division: tens left over
Level 8, Sharing Garden. Sometimes the tens do not share out evenly. The ten left over joins the ones, and the ones share it.
What your child does, card by card
When the tens leave some over. 72 ÷ 3: one ten is left, and it joins the ones. PlayType opens the lesson: “The tens left over join the ones.”
72 ÷ 3: 7 tens for 3 friends: 2 tens each. The beads work the column line by line, 72, 12 and zero, while the sum sheet below lights each line and ticks it; “2 tens each: 12 left”, “1 ten + 2 ones = 12”, “12 ÷ 3 = 4” and “Each gets 24” light up as the total grows. 1 ten is left. With the 2 ones it makes 12.
96 ÷ 4: the abacus makes 96, 16 and 6 by itself, a green ring on each bead just before it moves, and the sum sheet below ticks each line. 9 tens: 2 each, 1 ten left. 16 ones: 4 each. Each gets 24.
In Try it a green ring marks the next bead while your child works out 72 ÷ 3 and 56 ÷ 4.
The tiny practice drops the ring: work out 75 ÷ 5, 84 ÷ 6 and 91 ÷ 7, each round starting from its own number.
Then the beads hide and the sums 36 ÷ 3, 48 ÷ 4 and 65 ÷ 5 are done in the head, the answer picked from 12, 13 and 14.
You're ready! The tens left over join the ones.
What this lesson trains
23 answers in about five minutes. The tasks take 30 bead moves in all: 8 with a top bead and 22 with bottom beads. Clearing comes up 5 times. The largest is 91: tens and ones. Then 3 quick looks in your head. 1 of the 15 sums need a small friend (“−4 = −5 +1”); the others use free beads.
Your child’s first moves: work out 72 ÷ 3 and 56 ÷ 4.
The sum sheet
Below the abacus a sum sheet replaces the hands: it writes the column out, lights the line your child is on and ticks each line done; the total appears after the last line. The beads hold the running total the whole way down.
What PlayBuddy and PlayType say
PlayType: “The tens left over join the ones.”
PlayBuddy: “Share the tens first, then the ones.”
PlayBuddy: “One ten is left: not enough for three friends. Swap it for ten ones. Now there are twelve ones!”
Stars
Three stars for up to 2 slips in 23 answers, two stars for up to 5.