Adjusting to Subtract
Adjust the numbers.
53 - 38 = _____
53 - 38 = 15
Estimate the difference.
62 - 38 ≈ _____
62 - 38 ≈ 60 - 40 ≈ 20
Adjust the numbers.
65 - 23 = _____
65 - 23 = 42
Estimate the difference.
78 - 43 ≈ _____
78 - 43 ≈ 80 - 40 ≈ 40
Adjust the numbers.
83 - 41 = _____
83 - 41 = 42
Estimate the difference.
46 - 19 ≈ _____
46 - 19 ≈ 50 - 20 ≈ 30
Adjust the numbers.
66 - 18 = _____
66 - 18 = 48
Estimate the difference.
68 - 23 ≈ _____
68 - 23 ≈ 70 - 20 ≈ 50
Tabitha and Johnny have rock collections. Tabitha has 67 rocks and Johnny has 29. How many more rocks does Tabitha have? Adjust the numbers to solve.
38 rocks
There were 62 butterflies in the air. 26 of them flew away. About how many butterflies were left? Estimate your answer.
≈ 30 butterflies