Remember: To find the biggest, look at each one in turn, remember the biggest so far, and swap it when a bigger one comes. When you run out, the one you remember is the biggest.
Read and answer
Read the story, then answer.
One tower at a timeAt the robot club's tower contest, six block towers stand in a row in a dark hall. Maya must tell Ms. Park which tower is the tallest, but Bo can peek at just one tower at a time. Bo has a little memory box that can hold one tower. Tower one has four blocks, so the box holds four. Tower two has nine, which is bigger, so Bo swaps it in. Tower three has three, which is smaller, so the box keeps nine. Tower four has twelve, bigger again, so the box holds twelve. Towers five and six have seven and five, so the box keeps twelve. Bo has seen every tower, and the biggest is twelve.
1
Bo keeps the biggest tower so far in his memory box. Tower 1 has 4 blocks, and tower 2 has 9. What does the box hold after tower 2?
4139
2
Tower 3 has only 3 blocks, so the box still holds .
3
Bo swaps the box when the next tower is bigger than the box.
TrueFalse
4
Which tower makes Bo swap the box to twelve?
Tower 3Tower 4Tower 5
5
Which list shows what the box holds after each tower, from tower 1 to tower 6?
Bo puts tower 1 in the box without a swap. After that, for these six towers, he swaps the box times.
10
Mix-up to fix: Maya looks at four towers with 6, 3, 9 and 4 blocks. She picks the last one she saw and says 4 is the biggest. What should she do instead?
Keep the biggest so far in a box: that is 9, so 9 is the biggestPick the first tower, 6Pick the smallest tower, 3
11
Stretch: after three towers the box holds nine, so Bo can stop and say nine is the biggest of all six.
TrueFalse
12
Write six numbers on six cards and turn them over one at a time. After each card, write the number in your hand.
13
Draw Bo's memory box holding the biggest tower after tower 4.
Scan the code at the top to mark this sheet on screenTake a photo of your answers or type them. It is marked for you automatically, and your score is kept.