Rounding
Addition
Subtraction
Perimeter
Time / Elapsed Time
100
Round 326 to the nearest hundred.
300
100
43 + 32 =
40 + 30= 70
3 + 2 = 5
70 + 5 = 75
100
75 - 34 =
34 + ? = 75
? = 41
100
What is the perimeter of this rectangle?
4 + 7 + 4 + 7 = 22 yd
100
What time is it? 
12:30
200
Round 463 to the nearest ten.
460
200
143 + 256 =
100 + 200 = 300
40 + 50 = 90
3 + 6 = 9
300 + 90 + 9 = 399
200
254 - 121 =
121 + ? = 254
? = 133
200
What is the perimeter of this rectangle?
10 + 6 + 10 + 6 = 32 cm
200
What time is it?
1:50
300
Round 255 to the nearest ten.
260
300
357 + 236 =
300 + 200 = 500
50 + 30 = 80 + 10 = 90
7 + 6 = 13 = 10 + 3
593
300
634 - 328 =
328 + ? = 634
? = 306
300
What is the formula for perimeter?
length + width + length + width = perimeter
300
What time is it?
3:27
400
Round 350 to the nearest hundred.
400
400
463 + 379 =
400 + 300 = 700 + 100 = 800
60 + 70 = 130 = 100 + 30 + 10 = 40
3 + 9 = 11 = 10 + 1
841
400
631 - 476 =
476 + ? = 631
? = 155
400
Find the perimeter of this square.
6 + 6 + 6 + 6 = 24 in
400
I left my house at 7:10am. I got to work at 8:35. How long was I in the car for?
1 hour and 25 minutes.
500
Round 638 to the nearest ten and hundred.
ten- 640
hundred- 600
500
Write an equation with a variable. Then solve.
Ms. Lirette bought 264 pencils to start the school year. The 3rd graders brought in another 382. How many pencils does our class have?
264 + 382 = ?
200 + 300 = 500 +100 = 600
60 + 80 = 140 = 100 + 40
4 + 2 = 6
We have 646 pencils.
500
Write an equation with a variable. Then solve.
I collected 464 sea shells on my vacation. My brother collected 285. How many more shells did I collect than my brother?
285 + ? = 464
464 - 285 = ?
? = 179
500
Find the perimeter of this hexagon.
15+ 15 + 15 + 15 + 15 + 15 = 90 ft
500
I finished my homework at 6:25. I worked on it for 40 minutes. What time did I start?
5:45