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Number Trail Grade 4 / Week 02 / Friday
5/6
Week 02 · Add and subtract big numbers

Friday

Freddy's add and subtract game
// Place by place, with regrouping
⏱ about 15 min

Friday: Freddy's add and subtract game

Freddy the Frog has drawn a big number trail on a flat rock.

"Ribbit! Each stop on my trail has a puzzle," he says.

"Some stops add, and some stops subtract."

"If you get stuck, hop back and check your work by doing the opposite."

Chris and Bennie sit on the grass to watch.

"Remember to line up the places," Bennie reminds everyone.

Freddy jumps onto the first stop with a happy splash.

Game 1: Add

FIND THE SUM
  • Read the question.
  • Tap your answer.
5,647 + 2,896 = ?
38,452 + 47,619 = ?
206,735 + 395,487 = ?
80,999 + 1 = ?

Game 2: Subtract

FIND THE DIFFERENCE
  • Read the question.
  • Tap your answer.
9,204 - 5,867 = ?
70,000 - 31,524 = ?
481,562 - 239,748 = ?
100,000 - 1 = ?

Game 3: Missing numbers

FIND THE MISSING NUMBER
  • Read the question.
  • Tap your answer.
? + 2,450 = 6,000
9,000 - ? = 3,275
? + 17,600 = 45,000

Game 4: Story stops

SOLVE THE STORY
  • Read the question.
  • Tap your answer.
Freddy hops 4,825 times in May and 3,790 times in June. How many hops?
Bennie needs 10,000 stones. He has 6,482. How many more does he need?
Lizzy says 4,825 + 3,790 = 5,615. Is that reasonable?
ORDER THE DIFFERENCES FROM LEAST TO GREATEST
  • Find each difference.
  • Tap them from least to greatest.
11st
22nd
33rd
44th
SentenceTrue or false?
5,647 + 2,896 = 8,543?
9,204 - 5,867 = 3,337?
100,000 - 1 = 99,999?
6,000 - 2,450 = 4,450?
WHY THIS EXERCISE6,000 - 2,450 is 3,550, not 4,450.
Try it
Hop like Freddy 25 times.
Then hop 18 more times.
Write a number sentence for all your hops.
◇ ADD AND SUBTRACT WITH A GROWN-UP
Each of you writes a four-digit number.
Add the two numbers in a column.
Subtract the smaller number from the larger one.
Check each other's work by doing the opposite.

Ribbit! Great game. Tomorrow is a Number Hunt.

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