Math knowledge is power!
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Mr. Math Blog 1.3 (9:03)
Estimate Sums JoAnn's School (10:08)
Adding with Compatible Numbers (4:59)
Estimate when adding multi-digit numbers Khan Academy (3:39)
Estimate to add multi-digit numbers (Khan Academy)
SirRoundAlot -Estimating- (RoomRecess)
Astro Blaster Estimating SUMS (Room Recess)
Estimate sums to 100 (Mr. Nussbaum)
