Big Friends Bridge — Lesson 58: Big Friends Bridge test
The mix: plus 6 →Lesson 58: Abacus big friends test for kids
Level 4, Big Friends Bridge. 12 sums and 3 in your head. Get 12 right for the Rainbow Bridge sticker.
What your child does, card by card
Big Friends Bridge test. Show what you know! PlayType opens the lesson: “Test time. No hints. Show what you know.”
Then the test itself, 12 tasks without a ring: work out 3 + 9, 4 + 8, 4 + 7, 6 + 5, 7 + 4, 9 + 2, 12 - 9, 11 - 8, 15 - 7, 12 - 5, 11 - 3 and 10 - 1. Each gets one try, and a counter above shows how far along your child is.
Then the beads hide and the sums 7 + 5, 13 - 9 and 90 + 20 are done in the head, the answer picked from 4, 12, 14 and 110.
You passed! Big Friends Bridge is done. Next: Mix Mountain!
What this lesson trains
15 answers, roughly five minutes: 28 moves of the beads, 6 of them with the top bead and 22 with bottom beads. The largest is 15: tens and ones. Then 3 quick looks in your head. Friends do 12 of the 12 sums, by +9 = −1 +10, +8 = −2 +10, +7 = −3 +10, +5 = −5 +10, +4 = −6 +10, +2 = −8 +10, −9 = −10 +1, −8 = −10 +2, −7 = −10 +3, −5 = −10 +5, −3 = −10 +7 and −1 = −10 +9.
Fingers and hands
Below the abacus the drawn hands show zero and 3, 4, 6, 7, 8, 9, 10, 11, 12 and 15 here, finger for bead: the left hand counts the tens, the right hand the ones.
+9 on the fingers: the right hand lets 1 go and the left hand opens one more finger for the ten (−1 +10). +8 on the fingers: the right hand lets 2 go and the left hand opens one more finger for the ten (−2 +10). +7 on the fingers: the right hand lets 3 go and the left hand opens one more finger for the ten (−3 +10). +5 on the fingers: the right hand lets 5 go and the left hand opens one more finger for the ten (−5 +10). +4 on the fingers: the right hand lets 6 go and the left hand opens one more finger for the ten (−6 +10). +2 on the fingers: the right hand lets 8 go and the left hand opens one more finger for the ten (−8 +10). −9 on the fingers: the left hand closes one finger for the ten and the right hand shows 1 more (−10 +1). −8 on the fingers: the left hand closes one finger for the ten and the right hand shows 2 more (−10 +2). −7 on the fingers: the left hand closes one finger for the ten and the right hand shows 3 more (−10 +3). −5 on the fingers: the left hand closes one finger for the ten and the right hand shows 5 more (−10 +5). −3 on the fingers: the left hand closes one finger for the ten and the right hand shows 7 more (−10 +7). −1 on the fingers: the left hand closes one finger for the ten and the right hand shows 9 more (−10 +9).
What PlayBuddy and PlayType say
PlayType: “Test time. No hints. Show what you know.”
PlayBuddy: “Click Let's Begin, or press Enter!”
PlayBuddy: “Here comes the last one.”
PlayType: “Now do it in your head.”
The test and its sticker
15 answers, one try each, with no green ring and no help. 12 or more right give the Rainbow Bridge sticker; fewer, and PlayBuddy says “Not yet. One more try and you've got this!” and Play again glows. Nothing earned before is taken away.