Show:
Rounding to the Nearest whole number
Solving Equations
Estimation
Mental Math
Mystery
(for brave souls)
100
Round to the nearest whole number: 23.009
23
100
Solve. At the zoo, there are 47 armadillos. 39 of the armadillos are female. How many are male?
8 are male. N=8
100
In this problem should you estimate or give an exact answer? (DO NOT SOLVE) A school raised 113 dollars one week, 245 the next week, 341 the third week, and 377 the last week. About how many dollars did the school raise over those four weeks?
Estimate.
100
What is the number 7's pair to get to 10?
3
100
True or False? 7.04 > 7.004
True. 7.04 7.004
200
Round to the nearest whole number: 0.472
0
200
Which part of this word problem is the "N" or the unknown? Write in words. Do not solve. Rumina is baking 25 muffins for the bake sale. She has already baked 12. How many more does she need to bake?
How many more muffins Rumina needs to bake.
200
Paco had $102.54 in his piggy bank. Paco spent $52.54 on a new video game. Estimate the amount of money left in the piggy bank.
$50
200
When using mental math to add 99 + 71 + 1, which two numbers would you add first?
99 and 1 OR 99 + 1
200
Which property (of mental math) tells that you can add two numbers in any order and the sum will stay the same?
The commutative property.
300
Round to the nearest whole number: 846.289
846
300
SOLVE. Alec prints 24 pictures on Monday. Alec prints 85 pictures on Tuesday. Alec prints 60 pictures on Wednesday. How many fewer pictures did Alec print on Monday than on Wednesday?
36 fewer pictures on Monday than on Wednesday.
300
Estimate the sum. 49.1 + 2.5
53 (49.1 is close to 50 and 2.5 is close to 3. 50 + 3 = 53)
300
Use mental math. 350 - 110
240.
300
Write in standard form. 30,000,000 + 8,000 + 20 + 3
30,008,023
400
Round to the nearest whole number: 38,000,023.17
38,000,023
400
Write an equation containing N. Then SOLVE. Dixon bought a pack of pencils and then gave 12 away. He now has 24 left. How many pencils were in the pack of pencils that Dixon bought?
N-12 = 24 OR 24 +12 = N N= 36 or 36 pencils
400
Estimate the difference: 183-22
160 (183 is close to 180, and 22 is close to 20. 180-20 = 160)
400
Which numbers are easier to subtract? 141 - 99 OR 142 - 100
142 - 100
400
What are the next three numbers in this pattern? 4, 11, 18, 25 ...
32, 39, 46
500
Round to the nearest whole number: 56,210,899.51
56,210,900
500
Write an equation containing N. (DO NOT SOLVE) At the zoo, there are 47 armadillos. 39 of the armadillos are female. How many are male?
N + 39 = 47 OR 47 - 39 = N
500
Estimate the sum: $9.10 + $48.50 + $5.99
$64 ($9 + $49 + $6)
500
SHOW compensation to find the difference. 86 - 19 = ?
86 - 20 = 66 86 - 19 = 67
500
Does 15+(22+5) = (15+22)+5 ? What property can you use to explain why?
Yes. Associative property.