Missing Number (addition)
5 + _ = 12
7
5 + 7 = 12
_ = 17 - 5
12
12 = 17 - 5
Alex measured his boot and it is 23 cm. His brothers boot is 14 cm long. How much longer is Alex's show than his brothers?
Hint: Use your friendly number line
14 + 6 =20
20 + 3 = 23
So, 6 + 3 = 9
Solve 8 + 6 using TWO different strategies
8 + 6 = 14
Options:
- Tens blocks
- Stacking
- Friendly number line
Perimeter is the distance around the outside edge of a shape.
All the side lengths added together!
_ = 12 + 3
15
15 = 12 + 3
12 - 8 =
4
12 - 8 = 4
Ivy's pencil is 19 cm long. The pencil is 10 cm longer than her crayon. How long is Ivy's crayon?
A. 19 - 10 = c
B. c + 19 = 10
C. 10 - c = 19
D. c + 10 = 19
D. c + 10 = 9
Solve 15 - 7 using TWO different strategies
15 - 7 = 8
Options:
- Tens blocks
- Stacking
- Friendly number line
Will the sum of an even number + an even number be
a. even
b. odd
c. sometimes even and sometimes odd
EXPLAIN WHY
2 + 2 = 4
4 + 4 = 8
12 + 12 = 24
5
5 + 5 = 7 + 3
10 = 10
_ = 15 - 6
9
9 = 15 - 6
Number Rack:
A)
2 red beads on top
3 red beads on the bottom
What is the equation and answer?
B)
4 red beads on top
1 red bead on the bottom
What is the equation and answer?
2 + 3 = 5
4 + 1 = 5
Solve 43 + 29
Use your friendly number line
43 + 29 = 72
_ + 6 = 4 + 8
12 = 12
7 - 3 = _ - 2
7 - 3 = 6 - 2
4 = 4
Eli got 27 compliments yesterday and 65 compliments today. Reid got 38 compliments yesterday and 53 compliments today. Who got more compliments in all?
Eli: 27 + 65 = 82
Reid: 38 + 53 = 91
Reid got more!
Solve 56 - 35
Use your friendly number line
56 - 35 = 21
Solve 105 + 36
Use your friendly number line
105 + 36 = 141