Mental Math add/subtract
Name the mental math strategies for addition
Daily Double
add on, break apart, compensation
34 + 1902
1936
Create a bar diagram showing 45 x 6 and solving
Daily Double
270
Compare the numbers
3460_3406
Daily Double
3460 > 3406
Round to nearest hundred
4,568
4,600
Name the mental math strategies for subtraction
count up, count down, compensation
120,475,321 - 21,309
120,454,012
Mighty Fury and Wizards both wrangled 65 cows each, everyday for 4 days. How many cows did they wrangle in total?
They wrangled 520
Write this number in expanded form and word form
56,800
fifty six thousand eight hundred
50,000+ 6000+800
Round to nearest thousand
15,399
15,000
Use mental math and name which strategy you used to solve:
457 +923
1380
When do you use addition and when do you subtract? Explain
We subtract when we are comparing, looking for differences, etc
We add when we are combining answers, looking at totals
Wizards and Mighty Fury went to the rodeo and saw so many cowboys. They saw 15 riding bulls, 35 jumping and hollering, 47 eating, 6 shooting targets, and 17 rounding up cattle. Then they saw 678 rodeo clowns calming down the crowd of ducks. How many cowboys did they see today?
Daily Double
They saw 120 cowboys in total.
Write these numbers from least to greatest
567,888,656,900,1.76895
1.76895, 567, 656, 888, 900
If Mr. Shaw ate 345 protein bars yesterday and 410 today, about how many did he eat in all?
About 700 or 360
Use mental math and name which strategy you used to solve:
1,249 - 549
700
14,897,542,111 + 456,879,550,240
Daily Double
471,777,092,351
Is this correct 24,421- 15,029= 9,492 and if not why?
No because they didn't regroup correctly
Compare these equations
(935 + 1,436) _ (1,425 + 946)
(935 + 1,436) = (1,425 + 946)
If Rita Repulsa made 678 putties everyday, for 7 days straight, about how many did she make in total?
Daily Double
About 4900 or 4690
Use mental math and name which strategy you used to solve:
4th grade read 4789 books this year and 3rd grade read 5987, what is the difference between how much they read?
Daily Double
The difference is 1198
A building is being built with 16,351 bricks. The builders have placed 8,361 bricks, and they have 7,944 bricks left. Do they have enough bricks? How many more stones do they need if they do not have enough?
They do not have enough and they need 46 bricks
Sheriff Snargleflarf found Lord Zedd and then went into cowboy ranger mode to fight him. With that it gained 1000x more strength, 2000x more speed, and 15000 more intelligence. What are its new stats based on these increases?
Original Data:
Strength = (45 + 50)
Speed = (478 - 77)
Intelligence = 5
Daily Double
str= 95000
spd=802000
int=75000
write this in word form
999,999,999
Daily Double
nine hundred ninety nine million, none hundred ninety nine thousand, nine hundred ninety nine
Round to the nearest ones place
34,567.89
Daily Double
34,568